Homosexual Marriage. Why is the Church picking this battleground ?

[JayneK]

And what led to no-fault divorce? A culture in which artificial contraception was widespread. This has got to be the root I think. This is the point at which sex becomes divorced from its unitive and procreative purpose.

I think that divorce and contraception are so closely linked that we can't really say that one has caused the other.  It is more like a vicious circle.  Divorce leads to contraception leads to divorce etc.  They both need to be more clearly understood as serious sins. I think that going after these sins would automatically counter homosexual marriage.