Why not be against Satan?
That is exactly what many people ‘forget’. I am almost positive that ever atheist will change their mind if any formidable proof can be conceived of (a) God(s) existing.
I certainly would like to believe that this is true, but the fact is that there are quite a few atheists who are just as dogmatic as the most dogmatic religious person. These are atheists who do not believe in God for reasons other than lack of proof — because they have emotional issues, are morally lazy, etc.
Personally, I dislike these atheists just as much as I dislike unthinking religious people. I’d much rather have a conversation with an intelligent religious person than an unthinking atheist any day.