I have a lot of respect for Messianic Jews; they're struggle is real. I wish more Jews knew just how Jewish the story of Jesus actually is. As far as Christians are concerned, Jesus is the fulfillment of the messianic prophecies in the old testament. Jesus said, "Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill." (Matthew 5:18)

That said, there is arguably no simpler or purer form of Christianity than simply having faith in and a personal relationship with Jesus Christ.