What a deceiving serpent you are.
Human marriage is never called covenantal (an eternal contract with God)—and you know it. You couldn’t cite the reference if you tried.
Marriage is never called a “gift from God,” and you know it. Were it a “gift from God,” it might’ve been listed among the fruit of the spirit in Gal 5:22–23. In fact there’s no mention of it at all, and Paul in 1 Cor 7 uses no gift language and never so much as encourages marriage.
But you know all that. You’re out to trick Christians.
Whether divorce was “controversial” among rabbinic Jews is an irrelevant concern to Christians—who are never under Jewish law. You pretend to find “clarity” in Matt 19:8–9 when its terms are reliant on Jewish law, a pre-Crucifixion discussion between Jews. Gentiles are never taught or encouraged even to learn Jewish law.
But you know all that. Deception is your intention.
“Hardness of heart” is not an emotional condition and doesn’t translate as “cruelty” or “indifference.” It’s a theological term, as in Exodus 4–15, when Pharaoh’s heart is hardened in the course of the Exodus drama and seems to refer to communication with his deity.
But go ahead and pretend it’s about Gentile marriages, snake.