There is only one reason to be an atheist, and we all agree: There is no rational reason to believe in God.
'There is no reason to personally believe in God.' works better for me. Rational or irrational there is no argument that points to God for me. I put the personal reference in there because many atheists, I am one of them, find many reasons, rational and irrational, for others to believe in God. I also agree that existential issues are not germane, nor are definitional issues for God.
CaliberCadillac seems to enjoy the bread and circuses provided by his Christ. If he is hungry the loaves and fishes will sustain him. If his boat is sinking someone will walk across the water to save him. If he is needy God bless him.
I have other ways of dealing with hunger, danger, and other needs, and I think they are much more effective, but I certainly wouldn't suggest them to CaliberCadillac. They all take rational, intelligently directed action. Faith and prayer only get in the way."
In line with my long time thinking that one should let the believers believe. It seems that very few have the wherewithal to think for themselves about important issues. They do what they can to earn their tithe, and let the guy in the fancy dress worry about everything else.