1st. We have no direct evidence that the original hoaxers really did go to their deaths professing christianity.
2nd. It makes some remarkably flippant psychological presumptions to assert those responsible for a successful con which promises to outlive themselves must necessarily chose to reveal the con for what it is, and have it thus fade away in ignominy, rather than chosing to let the con outlive themselves and thus gain in their own egotistical minds a degree of mastery over their own deaths.
2nd. It makes some remarkably flippant psychological presumptions to assert those responsible for a successful con which promises to outlive themselves must necessarily chose to reveal the con for what it is, and have it thus fade away in ignominy, rather than chosing to let the con outlive themselves and thus gain in their own egotistical minds a degree of mastery over their own deaths.