In regards to keeping the government out of marriage.
Marriage has always been a civil issue until recently. It is matrimony that is a religious custom. The origins of marriage had nothing to do with religion. And religion did not want any part of it until they saw the money and control they could get from it.
For instance, the bible "says" nothing about marriage - what they bible is "talking about" is the rite of holy matrimony and that is not a right, but a religious concept. It is a rite of passage like birth, puberty ceremonies, betrothal, matrimony and death.
Marriage is a legal concept and always has been. It's about property rights, dowries, bride price, where families will live, who gets what land or goats. Marriage has never been about religion and matrimony is not marriage. However, it seems that most of the major religions want you to believe that it is the same thing.
Marriage was originally a civil ceremony, not a religious one. Marriage was originally about an exchange of property. Women were originally thought of as property. That is why they had dowries.
"This was done for many different reasons. It was to ensure alliances, binding powerful families together, and strengthening weaker families. It helped people survive in the barbaric era of early humanity. It was also to ensure that a mans children were biologically his. The female children were the mans property which he would bargain off to strengthen the power of his family while the male children would work and bring in money, also strengthening the family. Marriage existed long before Christianity existed, therefore it was created by man for survival purposes."
We should not give marriage to religion. It was never really theirs to have.