Normal is a poor description of what you’re getting at. The rate of homosexuality has no bearing on the morality or how natural homosexuality is.

People generally don’t assign moral implications to unusual genetic conditions like Albinism which are described as abnormal even though they are literally natural.

Homosexual exists across the animal kingdom, it’s literally both natural and abnormal mammalian behavior. That isn’t normally seen as being relevant to people’s acceptance of it.