Problem 1 - fifty years ago the beliefs would have been considered mundane and self-evident, and not discriminatory at all

No, of course not. 50 years ago gay sex was banned by law. In Germany the last bit of that law was only scrapped in 1994, so you needn't go back 50 years. Can you really expect that new ideas are adopted perfectly synchronously by law and churches, or what exactly is the problem as you say?

ThatBritGuy:

Do you consider that discriminatory too?