"Matthew 28:20 Teaching them to observe (do) all things whatsoever I (Jesus Christ) have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.2 Corinthians 7:1 ... dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God."
I am a retired pastor of
the Church of God (Tennessee).
My name is Isaac Livingston. I am from Neyyoor India.
The teaching of the only one sin that matters, is not often taught as a doctrine, but this teaching is implied in many Christian teachings. Just be we study that we have to know what sin is. So, you may take a look in this link for that. Link is, "what sin is?" Sin is not obeying God. But, bible teachers imply that nobody can obey God, it is not practical, and so God has given us a different way, which is not by obeying, but by believing Jesus Christ. This teaching is the trick of the devil, to deceive Christians. If we believe Jesus Christ means to believe what Jesus Christ says. If we believe what he tells us to do for eternal salvation, we will do them. But if we believe that Jesus Christ will take us to heaven, no matter what we do, it is not believing Jesus Christ, but believing the preachers. If we believe Jesus, we will do what he says. Jesus Christ says in John 16: "7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. 8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment: 9 Of sin, because they believe not on me; 10 Of righteousness, because I go to my Father, and ye see me no more; 11 Of judgment, because the prince of this world is judged." Out of this section, they pick up verse 9 "Of sin, because they believe not on me;" and say, that the only sin that matters is not believing Jesus Christ. First of all, believing Jesus Christ is not to believe anything about him from the preachers, but to believe what Jesus says. Secondly, verse 7 says, "he will reprove the world of sin," that this is to the world, but not to the church. The church should know better. Further, the Holy Ghost is reproving them about righteousness and judgment also. So, don't fall for the statement of either deception or ignorance. Believing a person, is not to believe that he will move a mountain, but to believe what he says. Trust him and do what he tells us to do. This is the true belief.
God Bless You