Don't believe any of it. The Holy Spirit will always deal with you according to His fruit in Galatians 5. If a person does not inspire love, peace and joy in you, and if their remarks are not gentle and kind, then it is not the Holy Spirit speaking through them.
When these hockey pucks say that God is speaking through them, it is a lie. God is not speaking through them at all. If it is not the Holy Spirit speaking through them and they are not being gentle and kind, then you can guess what spirit is speaking through them and we know that the devil is come to steal, kill and destroy, so he will use religious hockey pucks to dribble out despicable lies to vulnerable believers in order to get their faith away from Christ.
You don't have to be kind to the devil, or anyone who represents him. You need to treat these people aggressively because they do not represent Christ at all. When Peter unwittingly sided with the devil in trying to keep Jesus from the cross, Jesus was not kind or gentle with him. He said, "Get behind me Satan!!" And that shocked Peter out of his cotton socks!
The person who told you that God would kill you with holy fire was not representing Christ or the Holy Spirit, because God is not willing that any should perish, and that kindness and gentleness is two of His attributes. It is the devil who kills, and this person who said it to you was quoting to you what an evil, demonic lying spirit was saying to him about you.
Tell that person that they are an evil, despicable liar and that as long as he or she listens to lying spirits, you are going to have nothing to do with that person.
I don't normally post on here, but I must respond (with all due respect) to your post:
You state, "If a person does not inspire love, peace and joy in you, and
if their remarks are not gentle and kind, then it is not the Holy Spirit speaking through them."......Then you go on to say, "You need to treat these people aggressively because they do not represent Christ at all. When Peter unwittingly sided with the devil in trying to keep Jesus from the cross,
Jesus was not kind or gentle with him."
You seem to contradict yourself here. Just because a person is not speaking kind or gentle--which you admit Christ, Himself, spoke in such an ungentle way--does not mean they are speaking with the spirit of the devil. And you go on to "justify" why it is okay to speak in a harsh manner to someone, even to call them names like "liar".
Also, I'm not saying in any way that I agree with what the person said about God killing them with Holy fire, but I'm just pointing out what really stood out to me as inconsistent logic.
Also, the statement "God is not willing that any should perish" is not totally correct in convincing that God does not cause one's physical death. He is "not willing that any should perish, but that all should come to repentance" meaning they will perish, but He has provided for eternal life....for all who believe on His son.
Here are some Biblical examples where God DID cause someone to physically perish:
God's anger burned against Uzzah when he took hold of the ark and God struck him dead. (2 Samuel 6:1-7 and 1 Chronicles 13:9-12).
How about Ananias and Sapphira for lying? The coincidental timing and place of their deaths indicate indicate it was God's judgment.