Jews don't believe in Santa Claus (it is a Christian invention).
But it is essential for a religious Jew to believe in the coming of Moshiach. This is one of the 13 principles of Rambam, and every sage and commentator of the Torah agrees that the belief in Moshiach is a basic principles of Jewish faith.
I cannot see how Santa Claus can be compared to Moshiach though. That is a stretch of the imagination.