How do you know that the Bible is God's word, and that your interpretation of it is correct?
You rely on your own beliefs, assumptions, and biases in order to make that decision. You are relying on your own understanding and presumed knowledge-- that the Bible and your interpretation of it is God's word-- from the very start. I'm sorry, Lady B, but you just can't get around that fact.
You sure do seem to know a lot about God, God's desires, God's plans, God's needs, etc.
The very fact that there are hundreds of different ways to interpret the Bible destroys your "I only say what's in the Bible" defense. How do you know that your interpretation is the correct one?
EDIT:
Also, in a more nuanced point, you do claim to know God's mind-- the part that you believe he revealed in Scripture. It doesn't matter that you are getting your "knowledge" from the Bible, you are still claiming that you do know something about God's mind. So yes, every claim you make about God and his plans and desires, you are claiming to know that part of God's mind. You will continue to make that presumptuous claim, until the moment you stop making any claims at all about God and his plans and his desires.