One thing that has always bothered me about Church doctrine is the huge number of things that will have to be sorted out in the Millennium and spirit world. There are billions of Chinese and Indian people living and dying right now without any inkling of the church. People lived for thousands of years in epochs were there was no organized church. It seems a safe bet that the majority of God's creation will hear the gospel for the first time in the spirit prison. This doesn't really seem fair (whether to them or us, I can't tell).
What's the point of living on earth if everything will just have to be rectified later? Just to get a body? It seems wasteful.
It is odd to me that for thousands of years God confined his dealings to a small ethnic minority (the Jews) and seems to be doing the same today. If He could get his message out there more, He'd be saving a lot of work later.