The obvious flaw with Pascals Wager is, as stated earlier, that there are several Gods so even if the atheists are wrong you have to choose the right one. What if the Norse were right and you end up missing your chance in Vahalla by not dying in battle with a weapon in your hand? Should you carry a bloody great battle-axe with you at all times just in case.
Actually playing the odds you'd be better off as a Polytheist. Why not hedge your bets on several deities in case at least one of those is real, statistically its a safer bet than Monotheism right?
Thinking about it further there is quite a lot of overlap between the Ancient Greek and Roman Pantheons so you get Zeus thrown in free with Jupiter, and Ares with Mars.
Play it safe, make the smart bet and start carrying a Coin for the Charon the Ferryman