To Christians who use Pascal's Wager to justify belief?

If you use the "The Christian God might exist, so believing in him is, probability-wise, better than not" argument, think about this: There is an equal probability that a god exists who only sends Christians to hell, or only atheists go to heaven,than that of the Christian God existing. If you're so dependent on the "We can't really know" position, how do you know that these unfavorable Gods don't exist? If all possible gods are considered, the chances of an atheist versus a Christian going to hell/heaven are equal.