The reason why the Church, for ages, has stood behind the Biblical definition of Marriage as being between one man and one woman is because THIS is what the Bible says reveals the true character of God. This is the demonstration of God’s Love for us through one human’s love towards another.
The so called marriage the world is trying to push through does not reflect God’s nature, nor God’s love in any way! To redefine marriage elevates the importance of MAN’s expression of love over GOD’S. If you ever wonder, “what’s wrong with people just wanting to get married?” That’s what it is. It’s the Great Classic Contrast. God’s perfect Will and purpose for man versus man’s will. Man seems to always steer his will towards man rather than God, and as time goes by that becomes true in weirder and weirder ways. It’s always been like that.
Beloved, let us love one another, for love is from God, and whoever loves has been born of God and knows God. Anyone who does not love does not know God, because God is love. In this the love of God was made manifest among us, that God sent his only Son into the world, so that we might live through him. In this is love, not that we have loved God but that he loved us and sent his Son to be the propitiation for our sins. Beloved, if God so loved us, we also ought to love one another. No one has ever seen God; if we love one another, God abides in us and his love is perfected in us. (1 John 4:7-12 ESV)
It would seem to us that as Jesus hung on the Cross and died, the Sinful World says to Him, “You Lose.” But if that were true, then True Love, for us, Loses.
If Marriage is only about expressing love in ways that WE define love, then God’s love expressed and displayed in sending Jesus Christ to die was merely one of countless millions of ways to express love. That would mean that God’s Love towards us is mainly about us. And that would mean that His expressions of love towards humans is equal to any other expression of love between humans. If all the infinite Love that God has and is finds that it all terminates upon man, then the limitless worth of the infinite love of God is at the mercy and disposal of man.