Christians are warned to be on guard against temptation/Satan. But Satan is very tricky. How do they know they aren't already in his thrall?

If you pay attention at all you will see/hear those who propagate promulgate HATE. That is a Satan spokesperson. There are many of them on TV and in government. They are doing a he**uva job and convincing folks that hate is good and the more hate you feel the "better" it is for you and your family and your country. Satan has enormous power to cloud the mind and shackle the willing. Satan is winning. Wonder what God plans to do about it?