1- I’m glad you put the word true in quotes in your question “what is "true" religion?” because there is no agreed objective criterion for judging a religion “true”.
It is neither rules-based nor ritual-based.
2- Who decreed that “True religion is a relationship with God.”
3- I think the belief “that humanity is somehow separated from God and needs to be reconciled to Him.” Is a belief held mainly, if not exclusively, by Christians yet you say that “all religions hold” those beliefs.
4- You seem to be backtracking in “That said, true religion does have rules and rituals”
5- The idea that “rules and rituals are observed out of gratitude for the salvation God has provided – NOT in an effort to obtain that salvation.” appears to go against the very purpose of rules and regulations in many context one can think of. Take the rules and regulations that apply on the highways, for example. They are designed as an expression of gratitude. They are there to keep the highway system functioning smoothly and to keep each driver safe.
Your religion suits you just fine. Always has. Does that mean you reject all other religions as being specious/suspicious/inadequate?
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To reject all religions in total [apart from the one you believe in, of course] is not a reasonable approach. It is better to reject only those aspects of religion [and this could apply to your own one as well, if you’re up to it] which
a] are clearly harmful [to the individual, society or environment]
b] condone injustice, promote hatred towards or belittlement of others
c] are in direct and clear contradiction of undeniable and irrefutable truths
d] make less sense and are of less benefit than alternative belief or interpretation
I’m not saying that’s an exhaustive list, but I think that’s a good start.
A lot depends on whether your belief system is as you learnt or if you have changed or converted.
In the latter case you will be more directly aware of their relative merits and weaknesses.
In the former you should recognise that differences between yourself and others may simply be a matter of chance of your upbringing.
In either case an understanding of different beliefs and where they come from and ideally a willingness to modify your beliefs accordingly will be to your advantage.
Benedict Arnold 