Heaven is only for Christians who are Sons of God the Father and who mature as Sons of God - which is fully taught by our Apostle Paul (NOT one of the 12 Apostles). Romans 8 explains that we cry Abba Father and Romans 8:17 [says] “And if children (i.e., Sons of God], then heirs; heirs with God, and joint-heirs with Christ; IF SO BE that we suffer with him, that we may be also glorified together.” This verse “IF SO BE...” ONLY this second joint-heirs applies to those Christians - like Paul - who suffer with Christ; which is NOT a common event of every day suffering; but is exactly the sufferings of persecution from sharing the Gospel of Grace with all who both turn away from Christ or turn away from Grace in this dispensation of God’s Grace. Romans thru Plilemon are the NT for Christian’s today; the OT consists of Genesis thru Matthew, Mark, Luke, John. For Matthew, Mark, Luke, John are ONLY for Jewish people in the time of Christ’s ministry. Christ Jesus said: preach only to the lost sheep of Israel; not gentiles.
If heaven is only for Christians, how did Elijah and Moses get into heaven and therefore converse with Jesus Christ at the Transfiguration?
Another question: What about all the souls who arose from their graves and were roaming around Jerusalem and elsewhere (only certain people could see them). Were not they all waiting for Christ to enter into heaven so that they, too, could enter?