If you were to reject membership in all denominations which have homosexual members, you would very likely not belong to any of them, as there are mostly likely some homos in all of them.
“Do you not distinguish between the official teachings of an organization, and the practices of some of its members?”
This is known homosexuality - AT THE VATICAN - and known about by Popes and not eliminated.
Theoretical teaching has little effect when it is ignored by the people in charge.