Obviously, a reply to our post must be contrary to the intent of this thread, but I have been seriously reading the Bible for many years and have not reached your conclusion. In fact, I agree with the Church on this point about gay marriage
You are only partially correct about reducing love and the kingdom to rules because rules can be followed externally by appearances only, but that doesn’t mean we abandon rules completely, just see them in perspective. Love has to be internal and requires greater (not lesser) consistency and adherence. As Jesus said, he did not come to abolish the law but to fulfill it, as is clear from his Sermon on the Mount: “But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.” (Matt 5:28) He also made it very clear that marriage is between one woman and one man.
“For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh…” (Matt 19:5)
Before you go on with this, read the following words of Jesus very carefully:
“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven. ( Matt 5:17-20)