The problem with other ideas doesn't hinge on recruiting. It hinges on two factors. One is that if there are other ways to heaven, Jesus's death was not necessary. The second is based on the whole reason for Christianity, namely Jesus rose from the dead.
His execution certainly lends an importance to his teachings that other religious teachers don't have. According to the gospels, Jesus was executed for having the audacity to heal people on the sabbath, and in general for being a threat to the dominant religion of his place and time.
The second is based on the whole reason for Christianity, namely Jesus rose from the dead.
After reading the gospels I got the impression that the whole reason for Christianity was to rebel against the corruption of Judaism during Jesus' time and to spread the spirit of truth.