Can We Ever Really Know What Scripture Says on Controversial Topics?

Questions about how to respond to a pro-LGBTQ pastor who says we can’t really know what Scripture says about homosexuality or other controversial topics since we’re not apostles or prophets, and how to understand and apply prophetic books of the Bible like Jeremiah and Ezekiel.   How can I respond to a pro-LGBTQ pastor who says we can’t really know what Scripture says about homosexuality or other controversial topics since we’re not apostles or prophets? How do I study the prophetic books of the Bible? I’m struggling to understand—let alone apply—books like Jeremiah and Ezekiel.