It really don’t matter whether he is religious Muslim or not in his past. Act of sacrifice by Jihad wins him redemption from sin by works. A Christian wins redemption from sin by accepting Christ sacrifice of death burial and resurrection from a loving God.
Yes no matter how bad a lapsed Muslim is, he can leap to the front of the line to get in their celestial whorehouse they call heaven by doing jihad.
“Can’t Get Laid in Life! Kill Some Infidels & Do The ‘Old-In-&-Out’ for All Eternity!” Call K O R A N and ask for Mohammed! He will show you how!