The early church had many groups trying to hijack what Christianity was and meant. Several of these groups were fascinated with redefining who and what Jesus was to fit into their belief system they were developing. Most of these groups were the people that the New Testament was warning the early first century church to beware of their teachings and in some cases were kicked out of the church by the apostles.
So in modern times, when they dig up one of the writings of one of these groups it immediately trumps the gospels and New Testament because it satisfies the current desire to redefine Christianity and Jesus by the secular left. They always fail to mention that these new findings come from the opposition camp of early Christianity and usually spin it like it was lost information that the guys in the first century just were not aware of and did not publish in the Bible.
At the time Christianity was developing it was in direct competition with Mithraism. This was a very masculine cult, with blood initiations and favored by Roman soldiers. It certainly did not include marriage for its god. Perhaps marriage was underplayed to appeal to adherants of that group. I also think one reason it died was that there was no role for women in it at all.