Of course the poll will show more christians then the rest. Mostly because there are more ex-/christians on the forum.
But also because many ppl turn away from christianity. I've spent some time defending religions, and christianity is the hardest to defend. They all have some weak spots. Catholicism has more than the others

. Orthodoxism is somewhat saved by the "So WTH is your problem ?", "We just don't give a damn" and the "You actually belive that ? I was joking." atitudes, and the saftey in numbers. Protestantism: the more laidback divisions are the easiest (out of all christian denominations) to defend, the stauncher ones are a lot harder though.
Islam is very easy to defend though, especially in a deist-atheist confrontation. This one never requires as much effort as christianity.
Judaism OTOH has a preety big weak spot, but because jews are also a nationality the weakness is preety irelevant.
Buddhism is not very hard to defend either. Hinayana for the agnostics&atheists and Mahayana for the deists. They do have one weak spot as well, but it's easily brainwashable.
Oh yea, and hinduism - the same as judaism.