At the risk of pointing out the obvious, 'specific religious beliefs' are for some the main underpinning of their version of morality.
And any specific group of religious adherents has its good and bad eggs, there's precious little correlation between religious beliefs and moral outcomes, so your obvious point is irrelevant. Think of morality as "what you do" and religious/philosophical beliefs as "how you explain it." You can explain your actions however you like, but those actions are all that really matters.
As for sexuality, it's as much a moral dilemma as choosing red wine or white. Morality is determined by how you choose to use it... share the wine, hoard it, or steal it? Sip and enjoy, dump it on the floor, or spit it at your host? Drink moderately, excessively, or never at all?
