Mark doesn't hide:
I still believe that sexual expression between persons of the same sex is no more evil or good than is sexual expression between men and women...There's more, a lot more. Read it all. Mark writes succinctly and in a highly organized manner. I should learn composition from him.
As to marriage, I am convinced that holiness of marriage is not in marriage, but in God's blessing on people committed to life long companionship. I see no reason to suppose that God does not, or can not, bless such commitments when they are other than between a man and a woman. The Church ought do no less.