A mere change of name accomplishes nothing. While a new follower of Jesus must stay within their people, they must also experience the new birth.
Therefore if you have been raised with Christ [to a new life, sharing in His resurrection from the dead], keep seeking the things that are above, where Christ is, seated at the right hand of God. Set your mind and keep focused habitually on the things above [the heavenly things], not on things that are on the earth [which have only temporal value]. – Colossians 3:1-2
The power of any People Movement to Christ depends in great measure on the number of truly and fully followers of Jesus in it.