In John 3 Jesus is clear that unless one is born again, they cannot see or enter "the Kingdom of God."
I think many believers substitute "kingdom of heaven" here: that unless someone is born again, they cannot ever enter heaven.
The first question then is this: what is the full meaning here of "Kingdom of God."
I think most people on this thread would agree that the born again walk was just NOT Available to the saints under the Old Testament. So IF the first question is that "kingdom of heaven" is included in "kingdom of God" in that no one not born again can enter heaven - then WHEN were the Old Testament saints born again? Jesus is very clear that old Testament saints had to go to Abraham's bosom or paradise after death in his story of the rich man and Lazarus. I believe Jesus emptied Paradise and took them all to heaven.
Finally, when or where in Revelation would be the resurrection of the Old Testament saints?
Thanks for your input.