This is so false. Obedience to God is not an option. Obedience is not a gospel of works. A gospel of works is about having to become a Jew and do the law of Moses.To make this about an optional obedience to God is the biggest lie out there...and a lot of people fall for it...because they don't love the truth.
The purpose of grace is obedience to God's will. God will reject all who are not obedient to Him.
Its a lie to teach that God only accepts those who are (self effort - works) obedient.
In fact the Gospel is...>"Grace through Faith", 'without works".
So, your gospel is a deception, because your Gospel denies that the Gift of Salvation, is a Gift.
You replace the Gift of God, with "obedience".
This is legalism, and Paul defines it as a "cursed of God" teaching.
Find yourself here : Galatians 1:8