Actually the very statement about the Old vs. New proves the point that Christians do not have the "right" to force their religion on everyone.   By the way, homosexual relations were considered an act of war/aggression back in Old Testament days.  It is something that conquering soldiers did to humiliate/subdue their enemies, like prison sex.   That kind of nonconsensual rape is condemned by most rational people, but consensual sex between two adults is totally different.