When I first found out, I was shocked and maybe even a little upset. But I don't see him using Mozilla to advocate his own political beliefs, and I find his argument of "checking political and religious opinions at the door" when going into Mozilla good enough.
I don't see why we have to make such a big deal out of his personal opinion, as long as we don't have any indication that he'll be using his position at Mozilla to further his political agenda.
If we start hearing about gay men being refused to work at Mozilla under suspicious circumstances, or other such abuses, then I'll be outraged.