Yes! I do believed in the original sin and we need salvation through faith in Jesus because according to:
1 John 1:9 - If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
Acts 4:12 - Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
Galatians 3:26 - For ye are all the children of God by faith in Christ Jesus.
Acts 16:31 - And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
these verses are said for us to know that believing in Jesus Christ is for all from child to old.