If the theory of evolution says that all human persons, indeed all organic life forms, are constantly evolving not just biologically but also physiologically; then, given the need for the propagation of the species through reproduction of those who are most fit; then; what role do same-sex unions have in the evolutionary process which guarantees the survival, thus procreative reality, of the fittest?

In the ancient world of Greece and Rome, a favorite field of sociological study for homosexuals, marriage was always understood as that of a man and woman.  Because that is how you have a society—a man and woman having a baby.  Furthermore, in the world outside of Judeo-Christian thinking, sex was simply a matter of the dominator and the dominated.  It is the Torah and the Gospel of Jesus Christ which brings compassion and a deeper level of friendship within the union of one man and one woman. 

We understand the world in the via positiva.  The world speaks of the goodness of creation and order.  Yet, there is tragedy and bad things in the world.  Men are imperfect.  Sin happens.  Mankind has tried innumerable times to order and structure society so as to have civilization.  Jewish people were the anomaly within the world that they dwelled.  They were set apart.  They said no to human sacrifice, sodomy, temple prostitution, and the polytheism that supported these actions.  Jesus Christ did not come to liberate his people and all humans from the sexual mores of the Torah.  The woman caught in the act of adultery, John 8, shows the mercy of God as the answer to sin and not the condoning of the act of adultery.   It is impossible for Jews and Christians to hold to their religious beliefs, substantiated on being people of the Torah and/or the Gospels and letters of St. Paul, while at the same time denying the teachings found in those works.  A man or woman cannot be a Christian and deny the Torah, Romans 1, 1 Corinthians 6: 9 and the proclamations of Christ Jesus on the union of marriage being that of a man and woman.