Is there any reason now days to get married other than to produce children?
A marriage between two people, even without children is actually a good thing anyway, to set up the legalities of their joint and separate property, power of attorney in medical situations, and inheritance of assets. People living together without any legal paperwork end up in the real murky area of common law marriage whether they want to or not.
Not unless you know God and have a desire to do things His way.
None that I can think of. If marriage was simply a religious ceremony, that'd be fine. The problem with marriage today is that it gets government involved in your relationship. Outside of having kids, it's a needless risk.