Unfortunately, it's not a matter of "believing in Him", as if He were Santa.
Think about this: every demon who stalks the earth as well as SATAN HIMSELF believe in Jesus.
They can quote scripture too.
I agree with you there.
As James says: “Thou believest that there is one God; thou doest well: the devils also believe, and tremble”
For our belief in Christ to be of benefit to us we have to not only believe in His existence and divinity, but we have to follow Him.