I'm not Muslim (an agnostic Catholic if anything) but I love the Hadith

| If the final hour comes while one of you has a seed in his hand, if he can plant it before it takes place, let him do so.

I take it to mean it is never too late to do something good, even (or especially) something you will never benefit from.

I'm an atheist but I really like:

>Therefore man was created single in the world to teach that for anybody who destroys a single life it is counted as if he destroyed an entire world, and for anybody who preserves a single life it is counted as if he preserved an entire world.

(Directly from the Mishna in the Talmud Yerushalmi)

So maybe you didn’t lose your faith as thoroughly as you suppose.