The empirical research does not show that gay or bisexual men are any more likely than heterosexual men to molest children. This is not to argue that homosexual and bisexual men never molest children. But there is no scientific basis for asserting that they are more likely than heterosexual men to do so. And, as explained above, many child molesters cannot be characterized as having an adult sexual orientation at all; they are fixated on children.
Faith is belief absent evidence, so I guess they can believe that homosexuals have a higher tendency towards child abuse than straights if they want. But then, I don't think the church really believes this; rather, they're scared of the fundies and facts are irrelevant.
The real problem has been the church's failure to deal with child molestation when it happened. They preferred instead to bury the problem and shuffle the guilty off to another parish.
In any event, the real aberration is celibacy. They don't even want you to jack off. Don't they know that prostatitis is called "monks disease" for a reason, or that masturbation prevents prostate cancer?