>But, still most venom is focused on the least harmful religions because there is the least reprisal.
You have no evidence that's why they post more about Christianity. I have already presented several other explanations. To be explicit it could be because they don't want to feed biases against minority groups, they might want to target something which is a visible problem (evolution denial in the states), they might want to target the beliefs of people who have power to abuse (local officials), they might want to clean up their own house before they figure out how to deal with other countries and religions which they are less familiar with, etc.
Furthermore PZ Myers _has_ received death threats from Christians, so the idea that all Christians are just a bunch of friendly folks who would never hurt a fly, is absurd (though a lot of Christians do commonly make this argument). If you're making yourself a target, you expose yourself to every nutcase in the country.
> Compared to the Nazis and Communists the radical Islamists are a bunch of puppy dogs.
What do the Nazi's and Communists have to do with this?