David's throne is not in heaven. Sitting on David's throne is a way of saying being the king of Israel.He is king over all of heaven and earth, according to verses like Matthew 28:18 and Ephesians 1:19-22, and that includes Israel.
How about you address what I said about Acts 2:29-36, Douggg?
Yes, and, according to Peter, He sits on David's throne. But, He does not sit on any throne literally. This is speaking spiritually of His authority. He also is said to currently sit on the Father's throne (Revelation 3:21), which is heaven itself (Isaiah 66:1) and that is because He has all authority in heaven and earth (Matthew 28:18) and sits at the right hand of the Father above every name that is named with all things under His feet (Ephesians 1:19-23).
No, Peter said in Acts 2:29-36 that Jesus was raised up to sit on David's throne by being raised up from the dead. You should listen to Peter instead of believing what you want to believe.
That will be the eternal new heavens and new earth that is free of sin and death forever. Peter said we look for new heavens and a new earth in accordance with the fulfillment of the promise of Christ's second coming (2 Peter 3:13), so why are you looking for something else instead?
The Jews have yet to embrace Jesus as their King. In Matthew 23:39, Jesus said Jerusalem would not see Him again until Jerusalem, speaking of the Jews, say "Blessed is he that cometh in the name of the Lord." i.e welcoming Jesus as their King.