In your opinion what causes christians to believe in Jesus

[Angrboda]

Why do xian soldiers hide in foxholes when they know paradise is just a bullet away?

Because I'm right, and Christianity does not provide immunity from the fear of death or the pain of dying.

Immunity? Perhaps not, but that seems an unreasonable bar to expect. Does the promise of heaven and eternal bliss provide some insulation against thoughts of mortality. I think that's hard to deny.