The traditional haggadah refers to Moses only once. The Reform movement’s haggadah omits him entirely! But wasn't he the same Moses who challenged Pharaoh, led the Israelites out of Egypt, and brought them to Mount Sinai?
Yes, all true. But the ancient rabbis feared that Moses might become deified as a result of his great leadership. Moreover, the rabbis wanted to emphasize that God was responsible for Israel's redemption. So Moses only got a bit part in our Passover ritual.
--excerpted from The Jewish Home: A Guide for Jewish Living (URJ Press, New York)