Will We Always Be in the Image of God?

Let's look at the condition of infants and small children:

"But Jesus said, "Let the children alone, and do not hinder them from coming to Me; for the kingdom of heaven belongs to such as these." Matthew 19:14 (NAS)

"But when Jesus saw this, He was indignant and said to them, "Permit the children to come to Me; do not hinder them; for the kingdom of God belongs to such as these. "Truly I say to you, whoever does not receive the kingdom of God like a child shall not enter it at all. And He took them in His arms and began blessing them, laying His hands upon them." Mark 10:14-16 (NAS)

"But Jesus called for them, saying, "Permit the children to come to Me, and do not hinder them, for the kingdom of God belongs to such as these. "Truly I say to you, whoever does not receive the kingdom of God like a child shall not enter it at all." Luke 18:16-17 (NAS)

"See that you do not despise one of these little ones, for I say to you, that their angels in heaven continually behold the face of My Father who is in heaven." Matthew 18:10 (NAS)

Question:

According to these scriptures, what are the characteristics of infants and small children?

1. They are sinful, and need to do what adults do to become saved.
2. They need to be as adults are.
3. The "kingdom of heaven belongs to" them. Jesus took children and "blessed them" and laid His hands on them. Jesus said "...their angels in heaven continually behold the face of My Father who is in heaven."