Let's Bring Religion Into It

As many people are aware one of the main arguments against gay marriage is that it goes against people's religion. The Catholic church's definition of marriage is: "covenant by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring." So even if it didn't state that it was between a man and a woman a gay married couple would still not be able to fulfill all the requirements because they are not able to procreate. The original purpose of marriage was to be able to have children in order to keep the human race alive, and with a gay marriage this purpose remains unfulfilled. Also, keep in mind that the freedom of religion is in the United States Constitution and there is no amendment to accommodate gay marriage. So, should gay marriage, even though it is currently legal it might not necessarily stay that way,  remain legal? And does it infringe on some people's religious freedoms? These are important questions to consider when developing your viewpoint on this subject.