This is such a wonderful question. And one we must address now because there are people , just as you said, doing well without God ( supposedly ) as of now.
I am best friends with a non believer from Venezula, now in Argentina, who has also been through so much, but now in medical school to never know or want to know our Lord. She is a very kind and generous person. I am about to open a post similar to your question.
I did not know my Lord until I was 14. But I survived… the unspeakable… as a child, but did I really do it or was my Lord always with me?
Jerimaiah 1:5 Before I formed you in the womb, I knew you., before you were born I set you a part.’
Romans 2:15 ‘They show the work of the law is written on their hearts. while their conscious also bears witness, and their conflicting thoughts either even accuse them or excuse them.’
I did nothing of my own power. And when I fell to my knees to know this, my Lord Jesus Christ has given me so much more to know He is my only strength. We have His imprint on our existance. Consciouness of right and wrong embedded in our DNA . The will to survive and grow is from the same root, which is our only root in Christ Jesus.
We are born in our Father’s image. We can be of good conscious in Him even to not believe because no matter what we believe, we are His creation and we can not escape this. Nor should we want to. However herein is the conundrum to them, but not us. We know who sustains them and empoweres them, is our Lord who sustains and empoweres us! So then how do we bring them around to our Lord to see this?
I will like to read many post on this topic because it is very important to explain to those in hardship who have overcome, or those with no worries, or everyone …that our Lord is their reason and their stronghold.