If a Jewish person in the chorus wanted to sit out a Christmas carol because he didn’t believe what it was going to ask him to sing, nobody would complain about that. Really, why can’t this fellow sit this sicker “Zikr” out without repercussions?
Allah Rakha Rahman was born as A. S. Dileep Kumar. His mother was Muslim, his father was Hindu, and he was raised Hindu. After his father died the family had hard times and his mother turned to Sufism, Islamic mysticism. Kumar/Rahman was drawn to Islam himself and later converted and changed his name.
Then again, the article doesn’t say whether he quit on his own decision or whether he was told he couldn’t just sit out the song, so it’s possible there were repercussions.