Exactly. We readily agree that children do not earn their adoption into a physical family, even though if they are old enough, they have to go to court and give consent. Adoption is a free gift from the parents to the child. Yet, many are somehow persuaded by theologians who want to rip out the parts of the Bible that are inconvenient to them that if we have to give consent to God to be adopted by Him, that somehow constitutes "earning" salvation. It does not. Baptism is a surrender, not a good deed.