Jesus Christ was not an Adventist. The Seventh-day Adventist Church was founded many centuries after Jesus lived on Earth, around the 1800s.Jesus was a Jew. He followed Jewish customs and laws because He was born into a Jewish family and lived in a Jewish culture.The Adventist Church is a Christian denomination that believes in the teachings of Jesus and especially in His second coming (the "Advent"). But it was formed long after Jesus’ time.