Dave and Steve,
So, being homosexual is not wrong or sinful. Fine, but engaging in sex outside marriage is sinful.

Correct. No special rules for gay Catholics. The same rules for gay and straight.

They do not allow same sex marriage, but nor does any other religion in the world, nor most countries in the world and no single country in the world until about ten years ago, and still a large minority against even in those few countries that do now allow it.

You have no case that the Catholic Church persecutes gay people as claimed. They do not.