The same malevolent spirits who believe marriage has no natural meaning and order are the same reality-denying entities that believe sex (that natural state of being either male or female) is something that can be changed and rearranged at will.
This is "man as his own god" drawn out to its hideous, debased, destructive, and completely absurd end.
There is a growing segment of the population that will double down on lies to maintain the delusions, and they will do whatever it takes to silence the objectors.
I am afraid you are right.
Homo marriage is part of the Marxist plan to destroy marriage and render the individual a subject of the state.