If your God commands you do one thing and you still do another at what point are you no longer worshipping him but some other?

The law, including the Sabbath, was done away with.

(Colossians 2:16, 17) Therefore, do not let anyone judge you about what you eat and drink or about the observance of a festival or of the new moon or of a sabbath. 17 Those things are a shadow of the things to come, but the reality belongs to the Christ.
(Hebrews 10:1-10) For since the Law has a shadow of the good things to come, but not the very substance of the things, it can never, by the same sacrifices that are continually offered year after year, make those who approach perfect. 2 Otherwise, would not the sacrifices have stopped being offered, because those rendering sacred service once cleansed would have no consciousness of sins anymore? 3 On the contrary, these sacrifices are a reminder of sins year after year, 4 for it is not possible for the blood of bulls and of goats to take sins away. 5 So when he comes into the world, he says: “‘Sacrifice and offering you did not want, but you prepared a body for me. 6 You did not approve of whole burnt offerings and sin offerings.’ 7 Then I said: ‘Look! I have come (in the scroll it is written about me) to do your will, O God.’” 8 After first saying: “You did not want nor did you approve of sacrifices and offerings and whole burnt offerings and sin offerings”—sacrifices that are offered according to the Law— 9 then he says: “Look! I have come to do your will.” He does away with what is first in order to establish what is second. 10 By this “will” we have been sanctified through the offering of the body of Jesus Christ once for all time.

What you have described could be a process through which the number of sects have mushroomed into thousands and continue to do so.

Interesting---I'm thinking that most people use their God-given minds to understand Him better.

The problem is those that think their priest have the right to override, change and contradict what has been inspired.

And of course my comment would be that you do not understand the role of priests (and the bishops who have authority over them) in the Catholic Church.

And as I recall, we have the "keys to the Kingdom."

Some more thoughts of James as some choose to keep part of the Law but disregard others.

(James 2:10-13) For if anyone obeys all the Law but makes a false step in one point, he has become an offender against all of it. 11 For the one who said, “You must not commit adultery,” also said, “You must not murder.” If, now, you do not commit adultery but you do murder, you have become a transgressor of law. 12 Keep on speaking and behaving in such a way as those do who are going to be judged by the law of a free people. 13 For the one who does not practice mercy will have his judgment without mercy. Mercy triumphs over judgment.
(Deuteronomy 27:26) “‘Cursed is the one who will not uphold the words of this Law by carrying them out.’ (And all the people will say, ‘Amen!’)
(Galatians 3:10) All those who depend on works of law are under a curse, for it is written: “Cursed is everyone who does not remain in all the things written in the scroll of the Law by doing them.”
(Deuteronomy 14:7) However, you must not eat the following animals that chew the cud or that have split hooves: the camel, the hare, and the rock badger, because they chew the cud but do not have split hooves. They are unclean for you.
(Deuteronomy 25:3) He may beat him with up to 40 strokes, but no more. If he would continue beating him with more strokes than this, your brother would be disgraced before your eyes.

(Acts 15:1-20) Now some men came down from Ju·deʹa and began to teach the brothers: “Unless you get circumcised according to the custom of Moses, you cannot be saved.” 2 But after quite a bit of dissension and disputing by Paul and Barʹna·bas with them, it was arranged for Paul, Barʹna·bas, and some of the others to go up to the apostles and elders in Jerusalem regarding this issue. 3 So after being escorted partway by the congregation, these men continued on through both Phoe·niʹcia and Sa·marʹi·a, relating in detail the conversion of people of the nations and bringing great joy to all the brothers. 4 On arriving in Jerusalem, they were kindly received by the congregation and the apostles and the elders, and they related the many things God had done by means of them. 5 But some of those of the sect of the Pharisees who had become believers stood up from their seats and said: “It is necessary to circumcise them and command them to observe the Law of Moses.” 6 So the apostles and the elders gathered together to look into this matter. 7 After much intense discussion had taken place, Peter rose and said to them: “Men, brothers, you well know that from early days God made the choice among you that through my mouth people of the nations should hear the word of the good news and believe. 8 And God, who knows the heart, bore witness by giving them the holy spirit, just as he did to us also. 9 And he made no distinction at all between us and them, but purified their hearts by faith. 10 So why are you now making a test of God by imposing on the neck of the disciples a yoke that neither our forefathers nor we were capable of bearing? 11 On the contrary, we have faith that we are saved through the undeserved kindness of the Lord Jesus in the same way that they are.” 12 At that the entire group became silent, and they began to listen to Barʹna·bas and Paul relate the many signs and wonders that God had done through them among the nations. 13 After they finished speaking, James replied: “Men, brothers, hear me. 14 Symʹe·on has related thoroughly how God for the first time turned his attention to the nations to take out of them a people for his name. 15 And with this the words of the Prophets agree, just as it is written: 16 ‘After these things I will return and raise up again the tent of David that is fallen down; I will rebuild its ruins and restore it, 17 so that the men who remain may earnestly seek Jehovah, together with people of all the nations, people who are called by my name, says Jehovah, who is doing these things, 18 known from of old.’ 19 Therefore, my decision is not to trouble those from the nations who are turning to God, 20 but to write them to abstain from things polluted by idols, from sexual immorality, from what is strangled, and from blood. This post was edited by texasescimo at June 24, 2018 12:05 AM MDT

The notes below are some more thoughts of mine on your comment that "some choose to keep part of the Law but disregard others" I'm not commenting on the long passages of scripture quoted.

Don't Jews evicting people from the West Bank follow what makes good sense to them? Don't terrorist follow what makes good sense to them? Doesn't Trump follow what makes good sense to him? Don't Trump's protesters follow what makes good sense to them? 
God isn't demanding for us to sacrifice anyone. Many people, 'Christendom', Islam, Judaism,  atheist and people of other beliefs or belief systems have sacrificed their children in war for what makes good sense to them. Does that make sense to you? I never see you speak against it.

(Proverbs 3:5, 6) Trust in Jehovah with all your heart, And do not rely on your own understanding.  6 In all your ways take notice of him, And he will make your paths straight.
(Isaiah 55:8, 9) “For my thoughts are not your thoughts, And your ways are not my ways,” declares Jehovah.  9 “For as the heavens are higher than the earth, So my ways are higher than your ways And my thoughts than your thoughts.

What you imply in your first paragraph makes good sense. It would have been better if instead of saying "good sense" in my post above I had said "good common sense". However, your set of questions could still be asked even with that phrase unless by "common" we mean common to all, not just the specific group concerned, whether it be Jews, terrorists, pro-Trumps or anti-Trumps. Mind you, sometimes there is no common agreement on an issue even within a specific group.  For example, there are many Jews who are strongly opposed to the eviction of people from their homes.

Regarding your second para we need to clarify and agree that your phrase "sacrificed their children in war" doesn't mean killed their children but means they agreed to their adult children joining an army in action. You ask "Does that make sense to you?" I am in principle against wars, specifically against the killing and maiming of civilians, the destruction of non military property and the drain on resources which could be put to more constructive uses. I do see the need to protect women, children and others against an attacking army though, rather than leaving them to be massacred.

Most Christians think that it makes sense for God to send a totally innocent being to be tortured and killed in order that God can let the sinful can go free. However it doesn't make much sense to me.

How many countless millions of people would have been free to live their lives if not for some clever wag inventing God ..

There has never been a more critical time in human history when we need God more! The world marches on intently ignoring and denying the one they need the most. The majority have convinced themselves of his nonexistence, not wanting to acknowledge him because they think they have too much to lose. 

Amen

There is simply no need that a supernatural force must exis in order to enable our existence -nor to inspire writing of any various scriptures.