Plus they don't realize that the Bible =/= a single book, has 40 authors, was written over 1,500 years, and across 3 continents

My face when atheists tell me I can't appeal to God's word as my ultimate authority because that's a "circular argument."; However, they appeal to their logic and reason without realizing that any appeal to an ultimate authority appears circular because ULTIMATE AUTHORITIES can't appeal to anything higher!