"Where are the comparative attacks on young girls?" All over the place, if you bothered to look. But it wouldn't matter too much either, because this isn't meant to be a numbers game and I'd be repeating the same mistake you are making, viz. that paedophiles would be either homo- or heterosexual, or perhaps that those who attack children must necessarily be paedophiles. Often both of these assumptions are dubious: in the first place, I am sure that you will agree that it is possible to be attracted to women but not girls; and, likewise, to be attracted to men but not boys -- so that a true paedophile is, really, attracted to children rather than specifically one gender or the other.* Indeed, in general a paedophile is (almost) exclusively attracted to children rather than adults, so it is a dangerous mistake to draw conclusions about sexuality in either direction.
In the literature, child molestation is treated as distinct from paedophilia anyway, so the second mistake you are making is in treating the two as the same. Paul Blaney in his "Oxford Textbook of Psychopathology" notes that, "Some cases of child molestation, especially those involving incest, are committed in the absence of any identifiable deviant erotic age preference." What we should take from this is that various kinds of sexual activity are not necessarily linked and, once again, I stress that the picture is far too complicated for A-Level Probability to deal with, and that both of the assumptions you have made, that a child-molester is a paedophile, and that a man who attacks boys is homosexual, are at best dubious and are in fact just plain wrong. As far as I can tell, there is more hope of drawing a link between paedophilia and being left-handed than between paedophilia and homosexuality! (see, for example,
http://psycnet.apa.org/?&fa=main.doiLanding&doi=10.1037/0894-4105.18.1.3 )
Finally, I leave you with this paper that cites a great deal of research:
http://psychology.ucdavis.edu/faculty_sites/rainbow/html/facts_molestation.html
the overall conclusion of which is that no link can be drawn between homosexuality and paedophilia, including a thorough rebuttal of your own Family Research Council link from earlier.
*Intriguingly, the psychiatrist who first identified paedophilia specifially noted that the abuse of boys by homoesual men was not true paedophilia (see "Psychopathia Sexualis" by Richard von Krafft-Ebing) and was anyway extremely rare (though this was, to be fair, in the 1920s).