>> If God DID join them together. This is not always the case, I suspect. <<
Ahh, that’s what an annulment is: the Church’s inference that God did NOT join them together.
I’m sorry. If you stood at an altar and took vows you are joined together in the sight of God. Divorce is a painful reality in a broken and sinful world, but don’t blame it on God, or give people an out that they were never really married.