Acts 16:31 And they said,
Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
In a nutshell, this is what is required in order to be saved however,
James 2:19 Thou believest that there is one God; thou doest well:
the devils also believe, and tremble.
(paraphased)
believing that there is one God, thou believest the truth; but it will do you no good, any more than it does devils who believe the same,
unless it lead you to obey him.
John 14:15
If ye love me, keep my commandments.
Luke 8:15 But that on the good ground are they, which in an honest and good heart,
1) having heard the word,
2)keep it,
3) and bring forth fruit with patience.
So.....
Belief on the Lord Jesus is the first step in order to be saved however, as we see from James, mere mental assent to belief in Christ is not enough (the devils believe not only in one God but in Christ as Saviour of mankind yet their belief does not lead them to obedience) True saving faith will lead to obedience as we become more like Christ. We will not only hear the Word but be doers as well -
Luke 6:47-49 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.
James 1:23-24
For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass: For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was.
The "doing" of the Word will bring about fruit that Christ speaks of in John 15 - fruit that will remain !
Ray