We are indeed talking about matters of faith - but if Jesus was who he said he was I see no reason to say that he couldn't have risen from the dead. I don't believe he was/did but my point, pure and simple, is that arguing that Jesus couldn't have risen from the dead because humans don't do that is missing the point about Jesus.
Thing is though, the point that Jesus was who he said he was (or more accurately what other people claim he said) would be fine if: a) Christians could demonstrate this via an appropriate method, which they can't, or b) since they can't they would keep this stuff to themselves: but they don't since they have had, and would like to keep but are losing, special privileges for their beliefs in the public arena (such as in the public education system).
Therefore it is reasonable to challenge whatever points they assert, such as that a claimed miraculous resurrection from being dead is a historical fact.