It is no large observation to note that people do not usually fully understand all aspects of the Kingdom immediately at the time of salvation. That which is planted grows, flourishes and multiplies, until greater and greater light is revealed within. For, surely, the path of the righteous is like the growing dawn, it grows brighter and brighter until the full light of day (Proverbs 4:18). So, the Spirit comes to reveal to us all truth, to be our counselor, and to help us.
Salvation is not an agreement with a doctrinal statement, but it is an introduction to a person, Jesus Christ. It is meeting Him, and realizing that there is no other name under heaven whereby men might be saved, and that living with faith in this man, belief in who He is, is the doorway to Eternal Life.