born-again

Short definition from Wiktionary

Adjective

1. 1
   Having been spiritually changed through faith.
2. 2
   Having a renewed commitment to Jesus Christ.
3. 3
   Of or pertaining to evangelicalism.
4. 4
   Having a newly won zeal for some activity.
5. 5
   Utter; out-and-out.
6. 6
   Alternative spelling of born-again.

Noun

1. 1
   Someone who has been spiritually changed through their (Christian) faith.
2. 2
   Someone who has a renewed commitment to Jesus Christ.
3. 3
   An evangelical Christian.
4. 4
   Anyone with a renewed commitment to any kind of cause or belief.