Isn't Christianity Paganized Judaism ?

Yep. The entire Jesus store is pagan. The Christian idea of a virgin birth is derived from the verse in Isaiah 7:14 describing an "alma" as giving birth. The word "alma" has always meant a young woman, but Christian theologians came centuries later and translated it as "virgin." This accords Jesus’ birth with the first century pagan idea of mortals being impregnated by gods. Also the true messiah as described in Judaism isn't supposed to perform all of these miracles like Jesus did. The miracles that Jesus supposedly did were all from older religions, especially Buddhism (walking on water, water into wine.) The true messiah also isn't supposed to be a sacrifice. That idea definitely comes from myths and pagan ideas.