Let me begin by explaining some of these words for the children. Then I will be sure that most of us have understood what I mean. A doctrine is something the Bible teaches. It's a teaching. So what the Bible teaches about Christ is the doctrine of Christ, and what the Bible teaches about heaven is the doctrine of heaven.
Bible doctrine is Bible teaching.
The Bible does say a lot of different things about heaven and baptism in a lot of different places. And so in that sense there are a lot of different teachings about these topics. That is why you will only hear doctrinal preaching in churches where the Bible is considered to be an inspired unity. But I believe the Bible is God's word, and that God is not a God of confusion or contradiction. So what it says on various themes will fit together.