The point is no one who desires to continue in sin will understand Christ.
Really? Well, if you meant "sin" in the sense of an carnal sin of the flesh, you should ask if anyone had bothered to tell that to King David who was God's prophet and who nevertheless sinned repeatedly in the flesh yet knew and understood Christ intimately. Same thing with Saul/Paul, his sin was worse - it was his mission to destroy Christianity. Even after salvation Paul referred to himself after as the "chief of sinners".
However, the sin which neither committed, nor does anyone who is saved ever commit, is the sin of not having an all-encompassing and total trust in Christ's offering for the forgiveness of sin and of Him as Saviour.
I think the difficulty you have is that you can't fathom the size or depth of the forgiveness given to those
whom God has chosen for forgiveness: He forgives them to the uttermost before they understand or seek Christ.
Their understanding of Christ comes about from/by/after that they are forgiven.
He's saying if they heard and learned about God, they would go to him (Jesus) because they said,
how is it then that he saith, I came down from heaven? vs.42
He is't saying God puts a spiritual magnate on some people. He's saying if people truly love God, they'll love him. Why? Because he is the same as his Father. It's no different from saying if you hate Jesus, you hate God.
And after he said this, they were infuriated. Why is that hard to understand?
It's not hard to understand what you've said, it's impossible to understand because you either don't understand or you've misrepresented those verses. Where in them do you find "learned
about God"? It simply is not there. Instead, they say learned "
OF God", meaning that they must learn
FROM/BY God; that is, that God must first teach them - that is the only way it can happen. The point is that they CANNOT learn
OF God unless having been drawn
BY God: they must be drawn
BY God to be saved. That God does not draw everyone is evidenced by the fact that not everyone becomes saved. The "all" of v45 is of the "draw him" of v44 -- it is not for everyone ever born, if that's what you meant. He precisely tells us - using your phrase -- that He "puts a spiritual magnate on some people". How can someone love either Jesus or God if they don't know Jesus or God and only God's teaching of them can make that happen.
Those who were infuriated, were so because then as now, natural man cannot bear to hear that salvation is not within their power or choice to achieve, but only God's to give to whomsoever He may choose to. So then, why is it that you are unable to understand that?