Is marriage out of date? Christian or Muslim views

I'll answer from a Christian view. The quick answer is no. Marriage was meant to be a joining between two people under God. It has nothing to do with partnerships (not just gay relationships like most people think, but if two straight people want to join for life as well). Marriage is a Christian concept not meant for anyone, only those wanting to join together under God. This is not, and will never be, out of date from a Christian view. The way out culture views marriage however is completely different, and that idea of marriage may be out of date.