Can any Christians, ex-Christians, or Bible geeks help me out?

I’m writing a story in which the main character adheres to different religions at different times in her life, including a branch of Christianity. However, as I am agnostic, I don’t know a huge amount about the Christian Bible. Can anyone suggest one or more good Christian Bible verses that has/have a sort of “it’s all part of God’s plan” meaning?

I will be super appreciative if you can!