Of course they are. Both abortions and marriage “redefinition” involve declaring war on the Genesis 1:27-28 principle and divorcing marriage from the procreative act. While I don’t deny the existence of individual homosexual persons who hold pro-life views, the homosexualist and pro-abortion ideologies are inextricably linked to an anti-Christian and anti-procreative mentality.
The whole gay thing is a luxurious indulgence of a successful culture. If things got rough it would evaporate in a second. Abortion is different because it involves the morality of life and death of a person. I detest gay marriage but I find my arguments against it are mostly abstract, unlike my arguments against abortion. I think abortion is in a different category.