God sent His Son as part of a new Covenant. There's nothing inherently wrong with trying to follow the OT law (Messianic Jews do to this day), but Jesus is the fulfillment of the Law, and Paul's letters clearly state that certain rituals, dietary rules, and the like, are no longer necessary.
There are also passages, like in Hebrews and Galatians, where the author appears to condemn post-resurrection attempts to adhere to the Mosaic Law. I don't subscribe to the interpretation that law-keepers are rejected by Christ like some fundamentalists do, but it's always seemed pretty clear to me that Christians are not expected or supposed to observe the Mosaic Law. Especially not since Christ himself actually says that the Law of Moses was mistaken when he condemns the death penalty in John and the laws regarding divorce in other gospels.
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