Consider Pascal's wager. Even if there is no God, what is the harm in society practicing Christian beliefs?
What if the is a god, but not a Christian God?
Pascal's Wager only works if there isn't a god. If there is a god, but you pick the wrong religion, you're just as boned as if you simply don't believe. If multiple religions claim to be True, and none can offer real evidence, logically you should believe in none of them.
Hell, even if it is the God of the Christian bible, but the stuff that Christian ignore in the OT really are important (Suffer not a witch to live, shellfish is an abomination, if a farmer mixes two types of crop he is to be stoned to death, do not take the Lord's name in vain.. etc etc.)
I really hope you are not one of those that claims science solved the question
There are many literal claims made by many religions, in regard to Creation or their own subsequent history, which have been shown to be false.
For example, in the Christian (and Hebrew) bible: We know that young Earth creationist interpretation of Genesis is not possible. We know that not just the date, but even the pattern of creation is Genesis isn't what happened. We know that there is no sign of the events in Exodus (not the ten plagues, nor the escaping slaves, nor the Red Sea parting) in spite the Egyptians meticulously recording other such events (plagues, escaping slaves, weird events). Likewise the slaughter of the First Born in Jesus' time. We know that many of the battles in the bible didn't happen or couldn't have happened as written (the "Walls" of Jericho, for example). We know Jerusalem at the supposed time of David was a goat-village, not a major power as claimed. We know that much of the OT was not written when it was claimed, and can't go back beyond 800-900BC (and probably dates to around 700BC), due to references not matching actual history. (Even small things, like the foundation story of Abraham having pack-camels, which weren't domesticated until before 1000BC.)
Essentially whenever religions make factual, testable claims, they almost always turn out to be false. (So often, in fact, that finding a true claim in a religion or myth is really interesting and unusual.)