Text (SC/9th): Target player loses life equal to the damage already dealt to him or her this turn.
Damage that is prevented does not count toward the total. [Scourge FAQ 2003/05/30]
Worship does not prevent damage. It causes some damage to be unable to lower your life total. So any damage rendered useless by Worship was still dealt and is counted. In addition, Worship does not prevent loss of life, so the loss of life from this card bypasses Worship. [Scourge FAQ 2003/05/30]