The thing is we can have assurance that we are saved by our faith and love in Him, that shows in our obedience to Him.
But to also not be deceived and know that the true salvation does not come tell after we have endured this world while we are in our fleshly bodies.
We follow the commands of the Lord do to love for Him, and that love shows in obedience.
If somebody says that obedience is not needed, then they need to go back to the Lord's words and see that He disagrees with that teaching;
John 3:36
Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him.