How do you separate from bad friends without hurting them or making them think you’re stuck up?

Is suicide a sin? Is there scripture to support this claim?

Why do people fall away from the church and how can we reach out to friends who may have experienced this?

How do we know that Christianity is not just a distraction from an otherwise purposeless life (without a God that created us to glorify him) and the eventual reality of death. Could it just be a device that people use to create hope and something to live for?