No offense, and all, but I've heard both sides of this story.
I honestly feel that the blood clan didn't mean anything by their comment-- nothing offensive at least.
It was a joke. While science has shown evolution is more than a mere theory, religion is something just as sacred. And so, the ideas clash, and war. But the joke was harmless; I feel that it was horribly misinterpreted. Not only that, but it was a pretty clever pun, and I had a good laugh when I read it.
There's much need for a giant icebox here, as everyone needs to cool down a little bit. I mean seriously; "Evolution may be against some members religion"? That's NOT even an insult. It's not like they were saying your clan was an insult in and of itself. They were simply saying that the "Theory of Evolution" (Yes, that is what it's called) is against religious belief. As the clan name is "Evolution", it's clear that the joke was simply played off of a pun.