Just to point something out to the OP… I’m not trying to be intentionally obtuse and pick apart your post just for the sake of argument, etc… but I think the OP’s best place to start would be to research the arguments ~for~ it and find flaws in their arguments from there (some of the links provided previously have some good starting points)… you won’t find a great many arguments for it here

but you can always bring them here for help picking them apart, I’m sure. So…
No, but everything starts in and with the family. I know it’s been said before, but when the definition of “family” is unclear, society itself becomes unclear. I don’t see why our society wouldn’t be “destroyed” if homosexual marriage became the norm.
The same ways societies have adapted to change since the beginning. The “traditional nuclear family” only exists in fairy tales. “It takes a village to raise a child” has never been more true than it is today, only now the “village” is much much larger.
As for the word “Family”, the definition has been unclear for a long time:
1.
a. A fundamental social group in society typically consisting of one or two parents and their children.
b. Two or more people who share goals and values, have long-term commitments to one another, and reside usually in the same dwelling place.
2. All the members of a household under one roof.
3. A group of persons sharing common ancestry. See Usage Note at collective noun.
4. Lineage, especially distinguished lineage.
5. A locally independent organized crime unit, as of the Cosa Nostra.
6.
a. A group of like things; a class.
b. A group of individuals derived from a common stock: the family of human beings.
7. Biology A taxonomic category of related organisms ranking below an order and above a genus. A family usually consists of several genera. See Table at taxonomy.
8. Linguistics A group of languages descended from the same parent language, such as the Indo-European language family.
9. Mathematics A set of functions or surfaces that can be generated by varying the parameters of a general equation.
10. Chemistry A group of elements with similar chemical properties.
11. Chemistry A vertical column in the periodic table of elements
Not to mention that to say it that way “if homosexual marriage became the norm” has a hint of trying to say that if we allow homosexual marriages, then they will become “the norm” as in all marriages will become homosexual marriages.
(I know that’s not what you meant, lil flower
Back to the OP,
You can also find plenty of other threads dealing with different aspects of this subject that have been had in the past with the forum search too, like this one:
forums.catholic-questions.org/showthread.php?t=337081