Christianity and its paganistic origin

Magis who celebrated the birth of Jesus were said to be Zoroasterian priests. According to several surveys, actual birthday of Jesus Christ was the same or close date to the date of his resurrection. It's very confusing to celebrate his birth and death at the same date.
The birthday of the Zoroasterian supreme God of light Mithra was 25th of December so it's not completely unimaginable to speculate the worship of two religions merged at some point in history.
Christianity was from its origin paganistic itself. Paganistic from Judaism. Christian faith ought to tolerate more paganistic views judging from its paganistic origin.