I don't know about the laws in other states, but in Florida paternity is based on biology and not a church service. A bio-father has paternity rights. Marriage has only the first presumption of parentage---DNA rules.

And, an interesting example last month was when there was a paternity dispute with a 28 year old mother with six children by five different fathers. In the mix was a set of fraternal twins. DNA established each of the twins had a different father. And yes, the lady had had the benefit of a church ceremony. Those poor fellows in Child Support Enforcement do not have an easy life.

Publius