For those of the Religious persuasion, which is the worst case scenario? (details inside)?

our child comes to you and says they can no longer accept your way of thinking regarding God. Which would, in your opinion, be the worst choice they could make in deciding how to proceed with their lives; to become an atheist, an agnostic or to join a different religion? If religious, which would you consider the worst choice of the myriad available they could make?

Please note there is a separate question for those who are athiests.