Believing Another Gospel will Change Your Eternal Zip Code

Not too long ago, a friend, who I knew walked with Jesus for some time which now was not walking with the LORD, started telling me he was reading some books by a man who said that God was talking to him and showing him a new way of looking at this life and the eternal life to come. I will not tell you what these “new insights” were all about, but now I understand why this man was so confused and no longer serving Jesus. He asked me what I thought of his revelation. I know you might find this hard to believe, but I calmly told him what he was telling me was total heresy and that if he embraced it, he was a heretic under condemnation of hell fire… which, not surprisingly, he no longer believed in.
If a man claims God speaks to him, how can he prove it and how can we validate it? We are charge with proving all things and to hold fast to the good (true & sound). We know God was with Jesus because of the miracles he performed, and much more so because he rose from the dead. If any man claims anything other than or contrary to what Jesus stated, should we wait to see if he is raised from the dead to validate what he said to be true? If they are true, why would God who is the same yesterday, today and forever contradict himself or change His mind? Specifically, “There is salvation in no other name than Jesus Christ.” I am not talking about a debate on how old the earth is or were the 7 days of creation 24 hour periods. Regardless of what you believe regarding that, it will not change your eternal zip code. To think salvation can come any other way than through believing in Jesus Christ (which means repentance, not penance) will undoubtedly change your eternal destination. Why would you want to give someone, you do not even know, the precious time you have left to serve the LORD to consider something contrary to your faith in Jesus Christ? I would agree with the Apostle Paul who stated “But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let him be eternally condemned! .… let them be eternally condemned!” NIV Galatians 1.6-10