“If someone has accepted a false doctrine, such as Islam or Calvinism, do we as Christians have the responsibility to tell them they are lost and going to hell, if they don’t repent and ask Jesus to save them?”
Sometimes people ask the darndest questions.
neumatikos 
you already know my ready response….if any man lack wisdom let him ask…. I say that instead of a blunt “yes” because I think the Holy Spirit has a strategy for reaching each individual and it’s not a one size fits all. At some time each individual needs to hear the truth. But sometimes we forget the parable of the seed and let the word be sown on the pathways where the birds come and eat it. {v}
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Short answer: No.
Long answer: Acceptance of a false doctrine is not grounds for going to Hell, therefore telling someone they’re going to Hell for accepting a false doctrine is not an action in which the Holy Spirit will sustain you (since it only bears witness of truth).
Very Long Answer: witheld, on the grounds that if you’re not a Mormon, you’ll probably not believe it anyway.
–Howard “drive-by” Tayler
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That makes perfect sense, if one accepts the idea that we can be saved despite having evil thoughts. And of course one can repent evil thoughts just as one can repent evil deeds, so we can be saved despite having evil thoughts.
I am fairly certain that this has very little in common to the very long answer Howard mentioned. I wouldn’t be at all surprised if from a Mormon perspective this was terribly mistaken, as I have no certain knowledge of how official Mormon doctrine deals with sin.
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Since I’m not concerned with becoming a Mormon, I shan’t worry about it.  
The amusing thing to me when I read that question was that Islam and Calvinism fall into two very different categories: For Islam, the error is obvious. They don’t believe that Jesus Christ is the Son of God (who died on the cross for my sins). For Calvinism, the error is much more subtle. In fact, so subtle that I don’t know what it is. I think most people say it has to do with predestination. But what most people call predestination, Calvinists don’t believe in that. I checked.
 
So, I guess, the real question is, how do you answer a blanket statement masquerading as a question?
 
Ooh! here’s another one! Should you warn people that their government is going to collapse when they believe in evil government, such as Direct Democracy or Republicanism? 🙂
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…I have news for you. They’re all going to collapse — eventually. And eventually, every knee will bow to the one true King. Which, of couse, is why the world both hates & fears the followers of that King
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amen, mom-to-be (about the goverment bit). We are called to preach not to convince. God’s spoken truth is the only thing that can convict a heart about falsehood; that includes everyone saint or sinner.
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For my edification, please name one error of Calvinism with scriptural support.
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Exactly. Couldn’t tell ya. I do understand it’s supposed to be different from Lutheranism. But the differences, from a modern perspetive, I think are pretty inessential.
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