Great question. As far as I can see if one believes that Christ is the King, that He is going to one day return and set up His kingdom and that is will be a literal 1,000-year kingdom and they are mixing that faith with obedient works (will of the Father) and they are confessing their sins as necessary then they will enter the kingdom.
However, the question that I believe you and other pastor/teachers are going to have to answer to is why you led the children underneath your care astray by telling them that there is no need for them to be faithful, obedient, overcoming Christians, because everyone gets their little piece of paradise no matter how they conduct their lives on this earth.
Not going to be a fun time I don't think. But hey what do you have to be concerned about you don't believe it anyway right

Everybody will receive a crown of some sort and all will be well.