God judges people by their thoughts too, he can tell if they sufficiently adore him and will cast them down if found wanting. More than actions, thoughts can damn you as well.
I’m suprised you still hold this position after your Catholic breatheren have just demonstrated it’s irrelevant if an Athiest helps do good in the world, in fact St Augustine as quoted above describes even good actions by non-Christians as “glittering sins”.
“Good” in this context as living to serve others has nothing to do with being Good in Catholicism, you can be a pedophile and provided you believe in the divinity of Christ and obtained confession before death you shall be a saint wheras someone such as say…Ghandi will be burning for all eternity.
Basically all good is being nice about Jesus, nothing else. Feel free to kill or steal from as many people as you like provided you say sorry to him afterwards.