Christians: why is it that Trinity wasn't practiced before Jesus?

There was prophets and messengers of god who called people to believe in god yet they and their followers were all monotheistic. If they practiced the Trinity believe they would be preaching trinity to their people and their Jewish followers would be trinitarians as well. I also found out that some Christians... show more There was prophets and messengers of god who called people to believe in god yet they and their followers were all monotheistic. If they practiced the Trinity believe they would be preaching trinity to their people and their Jewish followers would be trinitarians as well. I also found out that some Christians don't believe in trinity. So, how can you all be Christians and not even agree if god is only one or one in three persons?!
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