Blumenthal is not talking about Christianity in general and neither am I. We are talking about the extreme radical right wing Christians, which do exist, and who are causing problems for democracy in the US. Looks to me like someone thinks we are only allowed to discuss extremism when it is practiced by Muslims. Well, I say, bullshit to that.

And by the same token, if someone above can say we're not allowed to talk about extremism among some Christians because it will stir up hatred for the whole group, we can also say that about Muslims. If we are not allowed to talk about the extremists in the Christian religion for that reason, they we are also not allowed to talk about extremists in the Muslim religion because it will stir up hatred for the whole group. Can't have it both ways.