“...remember King David who God called a man after his own heart, yet, he was also involved in murder and adultery. Do you believe he went to heaven - or Abraham’s bosom - as a place where the Old Testament prophets went until the resurrection of Jesus Christ...”
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Of a certainty, he did.
He prophesied of such a thing in what is universally affirmed as scripture.
We take getting on the stairway to heaven as a PhD rocket science problem and only end up worshiping our own brains. Christ said, enter it as a little child. I have spent all the years of my Christian life, learning how to do just that.