Interesting observation and questions KingJ. With the help of our Lord, I will attempt to give you some biblical answers. You ask, "Babies and the mentally handicapped makes for a very interesting discussion. Is God showing preference? Partiality is evil. Do babies stay babies in heaven? Should we kill our babies and guarantee them heaven?" I have been using the word innocent as a key word in this thread because it represents a condition that observes with great Grace....Lets look at the word innocent from "Strongs."
נָקִיא נָקִי
nâqı̂y nâqı̂y'
naw-kee', naw-kee'
From H5352; innocent: - blameless, clean, clear, exempted, free, guiltless, innocent, quit.
Total KJV occurrences: 43
From what I understand, this is not partiality. It is a position whereby God does not record their sins against them because, their knowledge of "good and evil" is missing from the innocent....Obviously, killing our babies so that they are guaranteed a place in heaven is not necessary. Beside, murder under whatever the reason is still murder according to God's Commandments.
You ask, "We know that toward the end of the millennium satan is released from the bottomless pit to tempt mankind for the last time. Why does God do this? "
There are two classes of people who populate the millennium, to my knowledge. I must confess that I have not refreshed my memory about that 1,000 year period for some time. My statements will be short and to the point. The two classes of people, will be those Christians who come thru the tribulation will still have their mortal bodies, and will populate that time period giving birth to children who will grow up to adulthood. Those believers who come with Jesus will also not only populate that period, but will also reign with King Jesus.
At the end of that 1,000 year reign of Jesus, Satan will be loosed from his prison and will go out and tempt the people who were born during the millennium....The reason? No one can enter the final Kingdom of God and His Son that has not been tempted and refused to follow Satan and his fallen angels or devils. Only over comers will populate the new heavens and earth for all eternity. I hope this helps a little.