Fellow Christian: Do we believe John 16:13-15? If you did not have the Bible could God still lead you in truth?

Yes, He is perfectly capable of leading us to the Truth, and to reveal things to us that we don't know. I know that when I got saved, God poured His Spirit on me, and I knew things in the Bible that I had never even read before-it was like I was "awakened". When I read them in the Bible, it was like "Wow-God already showed me that-I KNOW it is true!" If I had not had a Bible, God would have still revealed things to me, in whatever way He wanted to.