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by rsyring 2840 days ago

  "believe in Jesus"
It's not sufficient to simply believe in Jesus...as in a mental assent that he actually exists. The demons believe in God and shudder (James 2:19).

There must also be an entrusting of one's self to him, a yoking, whereby you give up "rule" over yourself and submit to his rule instead. To believe in Jesus but refuse to submit to him is rebellion. That's the state of demons and why demons are not saved even though they believe.

It is, unfortunately, the same state that many humans are in.

In addition to a trusting belief an attitude and acts of repentance must be present. Repentance is turning away from sin to God. This is a continual war for the genuinely saved because their sin nature is still present. They desire to serve God faithfully, but their nature has not yet been fully redeemed, so there is a constant battle going on to live to the Spirit and not the sinful nature (aka the flesh, see Galatians 5:16ff).

This is why most Christians really are hypocrites, with some being worse than others. They know the right way to live but do not do so perfectly themselves. Even the apostle Paul struggled with this:

"For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate. 16 Now if I do what I do not want, I agree with the law, that it is good. 17 So now it is no longer I who do it, but sin that dwells within me. 18 For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out. 19 For I do not do the good I want, but the evil I do not want is what I keep on doing. 20 Now if I do what I do not want, it is no longer I who do it, but sin that dwells within me" (Romans 7:15-20).

  However, if they "believe in Jesus", then no matter 
  how much they sin afterwards, they're good for Heaven, 
  scot free?
Yes. But I think you have an implied context that is wrong. The genuinely faithful are grieved over their sin. They look forward to the day when their sinful natures will be removed so that they are no longer even tempted to sin. Those who say they believe in Jesus but live open lives of rebellion to him and show no sense of remorse or repentance do not fit the biblical definition of someone who is saved and likely aren't. In 1 Cor. 5, Paul instructs the church to remove such people from it's midst which is where excommunication and church discipline come in today.

Also, as another commenter noted, it's not "scot free." Jesus suffered the punishment for all those who would come to believe. That is, God put their sin on Jesus and is now satisfied with the payment Jesus made. This idea is known as propitiatory atonement if you want to read more about the logic/justification behind it.