Well I’d just restate what I said before, because I haven’t seen any valid arguments against it in this thread, which was basically in agreement that the hypocrisy being pointed out by @doctorow is ridiculous, the only point of contention seems to be which side of the line you fall on to correct that hypocrisy (some people don’t seem to think ideological beliefs are important in figuring out why people act the way they do, which seems like a ridiculous position to take IMHO):
If a Muslim commits a violent act with the purpose to terrorise, and does so because of their religious beliefs, then it seems obvious to me that it’s perfectly reasonable to call that an act of Islamic terrorism (this applies to all Islamist groups), if a Christian were to do the same (and this Planned Parenthood situation would seem to qualify for me), then of course this should also be accurately described as Christian terrorism.