Assuming the crucifixation as factual history is the problem.
Instead, view it as a constantly occurring event in all of our lives. Which is that we all suffer, and suffering provides the opportunity to review actions and decisions, some which will be found to be in error. This capacity to view, judge, and make determinations is a rather important part of our makeup. The values we distill through our experiences are more important than the experiences themselves, and persist as experiences fade. The resurrection demonstrates that.
Dying is not apt metaphor for health.
The metaphors of Christianity are hateful to the body. The "flesh” hinders your spiritual growth and you’re to “die” to it and become inhumanly spiritual until you rise above it all.
It's ascetic beat-yourself-up self-denial to the core.
A life-affirming project would go the other way around: Drop the schizotypal sense of separation that comes from the ancient soul/body dichotomy. "Sin" tends to foster that dichotomy. And sin as "separation from God" is a separation from an introjected father figure and what "he" wants for you; which is immaturity.
Life-affirmation would include shamelessly being who you are as an earth-animal. Throw off burdening crosses and inflated ideals that’d make you disappointed with yourself, your life, the world.
You can learn and grow without crucifying yourself. And life's not that much suffering. I have doubts about the whole "suffer to learn" and "life is a struggle" stuff. A lot of learning is from curiosity, not from shoving your way through hardships.
Christianity as an ugly metaphor for good things is quite a stretch.