Kingdom of God, and Kingdom of Heaven - is there any difference?
The apostles taught of this kingdom of God as we read in many places. For example in Acts 28 verse 31 regarding Paul : ‘’ He proclaimed the kingdom of God and taught about the Lord Jesus Christ—with all boldness and without hindrance !’’ Matthew is the only Gospel writer to use ‘ kingdom of heaven ’. Mark, Luke, and John use the term ‘ kingdom of God ’. I discuss this briefly in the link here which takes you to my article in Quora.