I'm devoutly Christian to the point of occasionally evangelizing as we are called to do by Christ; and we (my family and friends and I) never verbally attack, insult, or otherwise denigrate atheists we meet or already know. Nor do we do that to gays we know. But if I had a business that dealt with weddings, as I once did, I could not in good conscience assist in a homosexual wedding ceremony which would be committing a sin in my faith. Not only would the gay couple be sinning, but those of us who assisted would as well. A priest in our Church could not attempt such a ceremony and would be sinning to try; and such a ceremony, if done in our Church, would be meaningless in the eyes of God.
God does not sanction homosexual marriage. We know this because of the eons of scriptural study and analysis of the beliefs as passed down in Church tradition. It will not change. People who are steeped in democratic tradition in this democratic country cannot get their brains wrapped around the idea that_ though God gave man the gift of freedom (free will to do as one wants including rejecting Christianity) once one accepts God and becomes Christian, Christianity itself is not a democracy but an acceptance of the rule of God in your life. God does not change political positions on issues because he doesn't get things wrong for them to need to be changed; and his followers cannot change his Church for they do not have a vote. It is not a democracy. Life for them outside the Church should be a free democracy, but not within it.