How is it that easy? We're not picking a team to support in the Finals series. The idea of believing in a "god" to me is as foreign as believing in a tooth fairy. When an employee of mine is openly religious, it is to me akin to him espousing a belief in something purely fantastical - tooth fairy, Santa Claus, etc. His choice and I don't deride it, but to me it is all entirely bizarre.
When I look at mysteries of our existence, of the creation of our universe, at no point does any fibre of my being whatsoever think to consider that a god-like higher power might be behind it all.
And even if you could force yourself to believe, without doubt, which god are you going to believe in to guarantee yourself some sort of 'eternity'?