It may be the first word and very important, but it is not the only word.
Acts 16:33 He took them in at that hour of the night and bathed their wounds; then he and all his family were baptized at once.
Yes, it is the parents responsibility to teach the Truth of Jesus Christ to their children so that they too many believe.
Perhaps with an open mind you will seek the Truth.
Peter [said] to them, “Repent and be baptized,* every one of you, in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the holy Spirit.u 39For the promise is made to you and to your children and to all those far off, whomever the Lord our God will call.”v 40He testified with many other arguments, and was exhorting them, “Save yourselves from this corrupt generation.”w 41Those who accepted his message were baptized, and about three thousand persons were added that day.x Acts 2
While that is true, it still does not teach infant baptism nor does it state that the baptism erases original sin and save the person.