Biblical Q&A - Why did God make the angels? (and other questions from a doubter)

According to the LCMS, Voice input

Question set: Questions for atheists More questions for atheists Questions for untrained Christians More questions for untrained Christians

Question

Why did God create the devil knowing that He would cause Adam and Eve to sin?

Why did God create the tree of the knowledge of good and evil?

Is Jesus' incarnation, life, death and resurrection for our salvation plan B to the failure in Eden?

Is someone who doubts fallen from faith?