Overheard: "Why can't churches marry anybody they want to?"
The quick, simple answer is that it is not the church who is marrying them, but God:
Mark 10:5-9 "5
"It was because your hearts were hard that Moses wrote you this law," Jesus replied. 6
"But at the beginning of creation God 'made them male and female.' 7
'For this reason a man will leave his father and mother and be united to his wife, 8
and the two will become one flesh.' So they are no longer two, but one. 9
Therefore what God has joined together, let man not separate."
Those verses address both the issue of the Christian definition of marriage, and why churches can't marry anybody they want to. It stymies me that this is an issue in Christian churches.