Are We Limiting God by Putting Him in the “Box” of Scripture?

Questions about whether we’re limiting God by putting him in the “box” of the 66 books of Scripture and how to respond to someone who continually talks about missing verses in the Bible and the idea that the Bible is owned by a corporation and isn’t trustworthy.

• How would you respond to someone who says we’re limiting God by putting him in the “box” of the 66 books of Scripture and we have no way of knowing all he has done or said because we’re human and can only know so much about God?
• What would you say to someone who claims to be a Christian but continually talks about missing verses in the Bible and the idea that the Bible is owned by a corporation and is not trustworthy?