Yes,one of the main the purposes of the epistle of John is that we may know that we have eternal life. (1 John 5:13) There are ways given in his epistles that we can know that we know Him, know that we are in Him, know that we abide in Him, know that we have passed from death to life, know that we have eternal life, etc.
1 John is also a polemic with the purpose of exposing the error of false teachers who deny the necessity of such things as are listed above. YET we must not miss an IMPORTANT POINT...The qualities by which we know these things are not prerequisites for salvation, they are things that accompany and follow salvation.
I hope you and I agree on this, and I suspect we do. AM I correct?
I do believe that no deceiver would teach obedience to God. It is the work of the enemy to deceive people and lead them to disobey God.
Just one point I was pondering bro, isn't it that the WORD of TRUTH, the gospel of our salvation speaks about the life, death, burial and resurrection of our Lord Jesus Christ? If I take away one part of it, would it still be the WORD of TRUTH, the gospel of our SALVATION?
Obedience to God is a very essential part of the Gospel of our SALVATION and taking it away from the WORD of TRUTH, the Gospel of our SALVATION would make it a half TRUTH and an incomplete Gospel of our SALVATION.
Jesus said,
NIV1984 Revelation 3:1-3
...I know your deeds; you have a reputation of being alive, but you are dead. Wake up! Strengthen what remains and is about to die, for I HAVE NOT FOUND YOUR DEEDS COMPLETE IN THE SIGHT OF MY GOD. Remember, therefore, what you have received and heard; obey it, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you.
JUST imagine a world without obedience to authorities would look like. Full of chaos, disorder and wickedness.
NOW imagine a gospel without the OBEDIENCE part...It's dead, no life and useless...Full of confusions.
Paul through faith and being led by the Spirit said,
NIV1984 Romans 15:18
I will not venture to speak of anything except what Christ has accomplished through me in leading the Gentiles to obey God by what I have said and done—
Have not much time now, still have to do a lot of work in the house now. If only I can just say I have FAITH and all these works are done in a snap. But i love my family and I am willing to do all this chores because of LOVE.
NIV1984 Galatians 5:6
For in Christ Jesus neither circumcision nor uncircumcision has any value. The only thing that counts is faith expressing itself through love.
God bless bro.