Evangelicals are good for one thing: Proving to others that any relationship you believe you have with God is self deception.
The nakedness of their self interest, and their desire to tear other people down, is so clearly shown in their puppet that they call God. God is a mouth piece of everything they must believe in order to cope with life. Once this is seen and hated in others, it is hard not to notice it in yourself and have any confidence in the truth of your own experiences.
Evangelicals make it difficult to see God as anything more than an embodiment of all our veiled interests.