Why “must” they apologize?
Their hatred of Christ and Christianity is well known, which if you look into their editorial staff is unsurprising.
Expecting them to apologize for their heartfelt beliefs is unreasonable. Instead, you should learn from the experience. Christ haters are still fairly adept at concealment, be glad they revealed themselves on this occasion.
Good point...I (not a Mormon) feel the same about the usual bashing of Mormonism by a small number of Freepers, when some “Romney” posts appear.