I'm not going to say the OP or any other post is wrong, I think some of them might misrepresent beliefs, Christian is very broad. Having said that, I think this could be helpful:
The Catholic Catechism:
Quote:
2357 Homosexuality refers to relations between men or between women who experience an exclusive or predominant sexual attraction toward persons of the same sex. It has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity [1], tradition has always declared that “homosexual acts are intrinsically disordered [2].” They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstance can they be approved.
2358 The number of men and women who have deep-seated homosexual tendencies is not negligible. [They do not choose their homosexual condition; for most of them it is a trial.] This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided. These persons are called to fulfill God’s will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition.
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I think the bottom line is at least for catholics, procreation is key. Marriage is the confines for reproduction as it is a holy union between Man, Woman, and God. Since homosexuals cannot reproduce, marry, they would be fornicating which is a sin. At least thats how I understand it.