Bee-dubya-ell mentions Pascal.

'Pascal's Wager' suggests that it is simply a safer bet....but as Walter Kaufmann (philosopher at Princeton years ago) pointed out, Pascal had only 4 possibilities in his list of wagers & outcomes.

There are MANY others....maybe 'God' doesn't want to be worshipped and has 'godly contempt' for anyone who would waste their time building shrines. Maybe (quoting Kaufmann) "he reserves a special place in Hell for those who go to Mass". Maybe there ARE multiple, competing gods who take turns running eternity...

The problem with Pascal's Wager is that it limits the wager to a narrow set of possibilities under classical Christian doctrine.

....but it (going to Hell if you don't) IS one reason to believe.