Make no mistake, the Bible is perfectly clear about marriage. There is no room for debate by Christians about whether ss couples can be married according to Scripture.
Three times God's design of marriage is noted in Scripture. In the very beginning of the Bible, specifically quoted by Jesus, and then by Paul.
First, we are told that male and female were created in the image of God. To desecrate that union in marriage by only including one gender is to desecrate the image of God.
Second, in Matthew 19, Jesus quotes God's design for marriage between a man and a woman when the Pharisees bring up divorce. When the disciples question the absolute union of marriage, Jesus offers three options that all involve celibacy. The first, a eunuch born that way, refers specifically to homosexuals.
Third, in Ephesians 5, Paul quotes God's design for marriage as a mystery reflecting the Bridegroom (Christ) and the Bride (the Church). It would literally be marrage to depict that union as two grooms or two brides!