You propose that God and Mother Mary both love humans and that God is all-powerful, correct?
Yes. All-powerful in relation to His very nature.
You also propose that whether or not those humans believe in God is crucial to whether or not they will spend eternity in heaven, or face the oblivion of non-existence, right?
No.
There's no oblivion in Christianity. Only God (Heaven) or the intentional rejection of God (Hell).
The soul is simple in structure and has no parts so it can't be subject to disintegration. The soul is immortal.
So, if some humans need some sort of scientifically verifiable proof to believe in God, then why hasn't He provided it?
Because His Will is people worshipping Him with spirit and truth (two metaphysical entities).
You've said that God is only bound by His nature, what part of His nature is preventing him from providing scientific evidence for those who need it to believe in Him?
A miracle is the closest of scientific evidence.
If it isn't outside of His power or against His nature, then that means He is choosing not to provide such evidence in a way that it can be verified as having come from Him.
Yes.
God cannot totally reveal Himself because this act would destroy the free-will of humans. This happens immediately at the hour of death of every human being.
Doesn't that make it seem like He has simply decided that such people are not worth saving?
Why?
He has, in essence, cursed us to oblivion by not providing something that would only require the slightest bit of effort on His part.
There's no oblivion. There's a "place" lacking God.
I don't know any loving parents who would act in such a way.
You must understand that there's a big picture that we don't see entirely.
But any loving parents would permit and let their children to pass through painful medical procedures to achieve a greater good.
If evil is inevitable and God chose to His presence be hidden from a scientific perspective you must be sure that these are necessary conditions to achieve a greater good.