In the beginning, Adam was alone.
God had just finished creating the earth and everything in it, and it was good. Except for one thing— God saw that it was not good for the man He'd created to be alone. Genesis 2:18 tells us:
The LORD God said, "It is not good for the man to be alone. I will make a helper suitable for him."
So, God called the animals He'd created to Adam. Adam named them, but after all that, it was obvious that God hadn't yet found what He was looking for. So, he decided to put Adam to sleep. Genesis 2:21-24 says:
So the Lord God caused the man to fall into a deep sleep; and while he was sleeping, he took one of the man’s ribs and then closed up the place with flesh. 22 Then the Lord God made a woman from the rib he had taken out of the man, and he brought her to the man. The man said,
“This is now bone of my bones
and flesh of my flesh;
she shall be called ‘woman,’
for she was taken out of man.”
That is why a man leaves his father and mother and is united to his wife, and they become one flesh.
Of course, it all went downhill from there with the whole fall of man thing, but that's not the point. In Genesis, God pointed out to us a foundational principle of our souls: it's not good for us to be alone. That could also apply to surrounding ourselves with Godly people, but that's not the point of what I'm writing to you either. In the beginning, God established the idea of marriage. He also established its sanctity, because if two people become one flesh, you can't separate them. That's why marriage is so important. One man, one woman, for life. Today, however, marriage has been devalued to the point where it's almost comical. With this suddenly popular idea of gender fluidity and self-defined truth, God's original purpose for marriage has been lost to us. God's Word is eternal and unchanging, but we have foolishly thought that we could redefine marriage. That's not our place. God set it up, and we can't knock down a foundation that God built. That's foolish. If I told you, "Hey bro, try and push over the Empire State Building by yourself with your bare hands," you probably would laugh. That's what we're doing. We, in comparison to God, are gnats. In fact, we're lower than gnats. We are powerless; we only have the fleeting power that He allows us to have.
Marriage is God's idea, and he didn't design something that foundational as a fluid idea. That's a human fallacy. Marriage is between one man and one woman. Not a whole lot of leeway there.
One man. One woman. For life. That's how God designed it. Even basic anatomy cries out to this fact. Gender fluidity and homosexual marriage are just perversions of God's initial plan. That's just how it is.