Q. Could it be that this person has become a Messianic believer? The Messianic movement is both Jewish and Christian believers that celebrate together as “One New Man” in Messiah. They fully believe in Yesuha, Jesus, and still follow the law of Moses. Jewish believers in Jesus, have not given up their faith, they have found their Messiah. But because our Father in heaven has given them special laws to follow, they have not abandoned them, they still follow the ways of old, but add joy to their holy days in Messiah Yesuha .
A. It’s a nice thought, and yes, I believe the person in the question is a Messianic believer. But the fact remains that during the church age there is no distinction between Jewish and Gentile believers. All are one in Christ (Galatians 3: 26-29). Obedience to the Commandments as an expression of gratitude for the salvation we’ve already received is something the Bible encourages. But anyone who believes that keeping the Law is necessary to achieve or maintain their salvation is trying to mix grace and works, and that’s something the Bible disputes. Ephesians 2:8-9 says we’re saved by grace through faith, not by works, lest any one should boast.