That depends on your definition of what an observant Jew is. In the bible, Christ was villified for NOT being an observant Jew.
Mat 15:1 Then came to Jesus scribes and Pharisees, which were of Jerusalem, saying,
Mat 15:2 Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.
Mat 15:3 But he answered and said unto them, Why do ye also transgress the commandment of God by your tradition?
The Jews of Christ's time had elevated their traditions over what the bible actually said. Sounds familiar to me.:-)
Too familiar.