Such marriage should already be a free equal and legal practice under religious freedom.
It does not need to be justified.
So this is disparaging INHERENT religious freedom,
Seawytch if you keep requiring such beliefs to be validated by govt.
The correct way is for people to CHOOSE to be pro-gay-marriage just like CHOOSING
to be pro-life; NOT forcing a decision through govt to FORCE on people. The govt is NOT supposed to be abused to FORCE ANYONE to change their beliefs.
Since BELIEFS cannot be mandated by govt, trying to justify BELIEFS does not make it any less wrongful for the govt to take sides. Whether the Justifications or Arguments are right or wrong, there is no reason to even argue about a belief that people already have a right to practice under religious freedom. This is as unnecessary as trying to prove Christianity or Spiritual Healing is good or bad to justify forcing through govt -- regardless of any such arguments proof or justifications, these beliefs CANNOT be mandated, endorsed, imposed by govt. They MUST remain free choice because beliefs are involved.
Pushing one side or the other is still abusing govt to impose a belief that not all people believe, and for some it is AGAINST their beliefs. To be fully Constitutional, there should be a consensus on beliefs and/or how the laws are worded to be neutral and representing all people, so nobody is imposed on by govt against their beliefs.