Did God create evil — and if not, where did it come from? Because 'free will' isn't as clean an answer as your pastor made it sound.
Isaiah 45:7 says God 'creates evil' (or 'creates disaster' depending on your translation). Either God is the ultimate origin of everything including evil, or there's something outside His control — and neither option is comfortable. Pick a side and defend it, because this question has broken more atheists AND more believers than almost any other.