The context of 'belief' in American Christianity simply leads someone to believe that Jesus Christ is real and even that He died and rose again. There's more to it. But don't take my word for it.
John 3:16
16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.
If you base your salvation on this verse alone, I warn you to search your heart and read the scriptures. You need only to go back two verses in the same gospel to understand what this means.
John 3:14-15
14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, 15 that whoever believes in him may have eternal life.
So you see, this 'belief' that we must have is tied to something else that happened in the Old Testament. Look at it with me if you will.
Numbers 21:5-9
5 And the people spoke against God and against Moses, “Why have you brought us up out of Egypt to die in the wilderness? For there is no food and no water, and we loathe this worthless food.” 6 Then the Lord sent fiery serpents among the people, and they bit the people, so that many people of Israel died. 7 And the people came to Moses and said, “We have sinned, for we have spoken against the Lord and against you. Pray to the Lord, that he take away the serpents from us.” So Moses prayed for the people. 8 And the Lord said to Moses, “Make a fiery serpent and set it on a pole, and everyone who is bitten, when he sees it, shall live.” 9 So Moses made a bronze serpent and set it on a pole. And if a serpent bit anyone, he would look at the bronze serpent and live.
We need to notice something very important here. Look in verse 7. What did the people realize? They realized and confessed that they had sinned! So now you have a situation where you have sinners, or to make it personal, a sinner in need of God's intervention and deliverance. A sinner in need of salvation. Praise God for verse 8.
Now we have a representation of the very sin, or serpents, that are causing the people to die. Moses makes the bronze serpent (verse 9) and sets it on a pole. Why? So that whoever looks on it, realizing he is a sinner and is in need of God's salvation, will live!
Now, look at John 3:16 in context on Numbers 21:5-9 and John 3:14-15.
John 3:14-16
14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, 15 that whoever believes in him may have eternal life.
16 “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.
2 Corinthians 5:21
21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.
If you still think it is enough to just believe, then read John 8:31-47. Jesus is talking to Jews that had believed in Him, but He tells them they are of their father, the devil and that they are not of God.
Just thought it was worth pointing out.
For Christ,
j