Hypothetical Question: If you wanna change your religion then which religion you will absolutely avoid and why?

Frankly all religion is ultimately bad just like guns are ultimately bad. Sure most people may use either one responsibly but you only need one insane "prophet" to go on a mass shooting spree. Religion gives them the tools to push themselves over the edge. And the insane will always gather some type of following. See Jonestown for example.
And a loooooot of mental illness hides behind "the sacred". Oh you cant touch that it's sacred. Oh you cant call that a mental illness it's sacred. No a mental illness is anything that stems from the brain and causes a loss in the quality of life to the individual and the the world around them.
If you are a terrorist, that's a mental illness. If you preach hate and violence, that is a mental illness. If religion turns you into just as bad or even worse person that is a mental illness. But extremism is not even recognized as a sickness. It gets to hide behind a special status called religion or faith or what have you.