Well Satan and the fallen angels believe in Jesus - they even believe he created the world and that he was raised from the dead, and that he sits at the right hand of the father, and that he is coming back! Are they going to heaven? Clearly, one must do more than merely 'believe'. The essence of new life in Christ is its productivity - there will be fruit in their lives... a) Ephesians 2:10--"We are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them." The fruit of salvation is good works. b) James 2:17, 22--"Even so faith, if it hath not works, is dead" (v. 17). A life that has no evidence of fruitful works does not have an active faith. Legitimate saving faith is productive, even if it's only in a minimal sense. Verse 22 says, "Seest thou how faith wrought with [Abraham's] works, and by works was faith made perfect?" That doesn't mean you're saved by works; it means your works are the end product or evidence of salvation. c) Matthew 7:16-17, 20--"Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so, every good tree bringeth forth good fruit .... Wherefore, by their fruits ye shall know them." The attitudes and actions of a person reveal whether an individual is a believer or not. There is no such thing as a believer who doesn't bring forth some good fruit. d)Matthew 12:33--"Either make the tree good, and its fruit good, or else make the tree corrupt, and its fruit corrupt; for the tree is known by its fruit." e) Matthew 3:7-8--"When [John the Baptist] saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come? Bring forth, therefore, fruits befitting repentance"--that is, fruits that are connected with salvation. f) Romans 6:20-22--"When ye were the servants of sin, ye were free from righteousness. What fruit had ye then in those things of which ye are now ashamed?" (v. 21). The implied answer is none, because they weren't saved. And fruit they had was the fruit of sin. The contrast comes in verse 22: "But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life." Every believer has everlasting life, which is the culmination of a righteous life. Therefore, people who don't bear fruit cannot be believers. Not everyone who calls Jesus, Lord is saved.