I think it will be awkward no matter where one puts it.
There is an underlying thread of unity in all the religion's mystics, but they all are in different religions as well.
I did always think it kind of strange being in the Alternative section, since it is more one part of most religions than it's own religion, and though it is often associated with the New Age movement currently, that is inaccurate historically and by definition.
But, it's a toughie about where to stick it. If you separate mystics out by religion, you might miss some of the unity, but if you don't, there's bound to be some weirdness because we come at things from different traditions.
Overall, though, I have thought maybe it's own section would be best outside the Alternative section, since that seems kind of odd if you're into kabalah, or Christian mysticism, or another tradition that is really old and has little in common with the other forums in that section- magick, neopaganism, etc. There is the danger of reinforcing the stereotype that mystics are somehow not part of the monotheistic traditions, or are some recent New-Age invention, both far from the truth.
Eek. Tough call. I am happy to just post here, there, and everywhere.