Accepting Christ is just the first of a wonderful journey.
It tells us in Ephesians 2:10 that God has created a new work in him to do good works. “ For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.”
point him to the gospel and tell him it’s the lords word the word of his eternal judge
“For the Father judgeth no man, but
hath committed all judgment unto the Son: Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.”
John 5:22, 24
After that point to him deeper into the word
“Then said Jesus to those Jews which
believed on him, If ye continue in my word, then are ye my disciples indeed; and ye shall know the truth, and the truth shall make you free.”
John 8:31-32 KJV
if someone believes this
“For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.”
John 3:16
point then to more of what he said that calls then closer to him In Repentance and obedience
“And
why call ye me, Lord, Lord, and do not the things which I say? Whosoever
cometh to me, and heareth my sayings, and doeth them, I will shew you to whom he is like: he is like a man which built an house, and digged deep, and laid the foundation on a rock: and when the flood arose, the stream beat vehemently upon that house, and
could not shake it: for it was founded upon a rock.
But
he that heareth, and doeth not, is like a man that without a foundation built an house upon the earth; against which the stream did beat vehemently, and
immediately it fell; and the ruin of that house was great.”
Luke 6:46-49
Eventually thier faith will sound like this
“Wherefore
lay apart all filthiness and superfluity of naughtiness, and receive with meekness the engrafted word, which is able to save your souls.
But
be ye doers of the word, and not hearers only, deceiving your own selves.”
James 1:21-22 KJV
That way he won’t think “ I said I believe so I’m saved no matter what I do “ instead his faith will be created by hearing and believing the gospel the things God said are true of salvstion and he will grow up into the word d not away from the word