If they do not know Christ they surrender to goodness or love. They intuitively know to love their neighbor and serve the poor. They are doing God's will guided by the Holy Spirit rather than the Bible.
How do you reconcile what you say here with Ephesians 2:8? God's free gift of grace is through that of Christ Jesus who is our faith and in whom we are saved by Him.
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Those that do not believe in Christ have already damned themselves no matter if they seem to be good people and help others as our own righteousness is as a filthy rag to God. Isaiah 64:6, 7.
John 14: 6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
John 14:26 But the Comforter,
which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
The Holy Spirit was sent down to indwell those who are Spiritually born again from above, John 3:5-7, as He, being the spirit of God is sent down by Christ. The Holy Spirit teaches us the true doctrines of Christ, being that what He has already taught orally in what we now have as being the letters the Apostles wrote to the various churches they helped to establish, and what we call the Bible.
God calls us and by faith we are saved by His grace, not of works.