If Anti-Mormon is correct then Anti-Othrodox Christian would be correct. To shorten it to anti-Christian or anti-Christ would be disingenuous and only used to further your own opinion.
For example could I call you anti-patriot because you opposed the P.a.t.r.i.o.t bill?
So to call a Mormon an anti-Christ is bad form. They have repeatedly stated they are not against Christ, just against your interpretation.
Well, I don’t think anti-mormon is “correct”! And CC doesn’t either. Wanna call THAT bad form?