Like little children, we are powerless, handicapped and disabled to enter in with Christ within our human (or natural) abilities.
Rather, we are totally dependent in faith on the love grace and mercy of our heavenly Father, who provided his Son Jesus in our behalves!
Without Salvation by Grace alone in what Christ has done, we are powerless to enter into the kingdom of heaven by simple childlike faith. This is why many will be gathered up and cast into the fire to be burnt, as they had not believed upon the only name which we might be saved; Jesus Christ.