Hey all atheists answer dis?

I need you're opinion on this so why do you not consider it Evidence for god when emperor constantine of rome prayed to the christian god and said to god that if god helped him win the battle he would convert to christianity and make the state religion Christianity I mean he didn't make christianity to control people he could have used pagan religions to control people and he would have had more freedom because the ancient romans participated in orgies and other things like that so why choose christianity which would mean he would have to live a chaste life and since he won the battle do you think it was just pure luck and god had nothing to do with it