This statement is questionable for at least three reasons:
(1) Has there ever been a civilization that wasn't "obsessed" with money? I would say that caring about money is that's practically a pre-requisite for being civilized.
2) What does it mean to "embrace" homosexuality? I'm not sure exactly which examples you're talking about in France, but certainly in the loooong histories of classical Greece and Rome, homosexuality was tolerated under certain conditions, mocked in other conditions -- and the degrees of tolerance, when such existed, varied from one era to another.
(3) Christianity became the state religion of Imperial Rome in 380 AD; Rome was conquered and looted TWICE within the next century (410 by the Visigoths and 455 by the Vandals). By your logical standards, then, the embrace of Christianity caused the internal rot of this once-mighty pagan empire much more quickly and devastatingly than any "embrace of homosexuality" did.