Yeah, that’s a convenient gripe. Considering that the vast majority of people in the west have some kind of tie to the Christian religion via family, friends, co-workers, and not to mention a near constant favourable exposure to it in the media, I think it might be a fair statement to say it is part of our culture. As such, we have a right to criticise it as members of a community that are profoundly affected by it.

Islam on the other hand is, for the most part, a religion that falls outside the western mainstream. Given this, it can, without much difficulty, be considered a marginal group in the west.

The point being, as Christianity is very well known and very powerful group (even if not a cohesive one), which exerts intense pressure on all of us. Islam, conversely, is largely misunderstood, is pretty minor and has very little influence, outside the extremists, in the west. It is because of these differences that some tend to be more careful in their attacks on Islam, than on Christianity.

Your implied argument seems to be attempting to suggest the de facto conditions that exist for these two religions are the same here in the west. Clearly, however, they are not.

Obviously you’re entitled to your opinion, but this is likely why some might disagree with it.