So it was brought up to me quite recently that while John 6:37-40 explains what the will of the Father is the will of the Father doesn't always get accomplished because its also in the Father's will that nobody be lost and yet a good chunk of people will go to hell.
That's because God allows us to choose. We love and worship him freely - we know what the world has to offer and that we may be persecuted, but we do it anyway. Because we WANT to; not because we have no alternative.
Yet if someone - KNOWING God's love and having every spiritual blessing in Christ - chooses to walk away, not repent and not come back to God, (I can't understand why anyone would do such a thing, but anyway), and if they deliberately and obstinately keep this up til they die - they will spend eternity without God.
Jesus taught Eternal Security for those who believe in him. There isn't a single way that a true believer can lose their salvation
No, I don't think we can
lose it - if someone gets Alzheimer's, becomes mentally ill or gets to a point where they cannot carry on walking with Jesus, reading Scripture etc, I believe they are still saved.
But if someone deliberately rejects God - see above - willingly choosing to do so, maybe following another religion and never turning back; I think that is different. They may have thrown away or surrendered their salvation rather than lost it.
So there you go! Jesus ALWAYS does what is pleasing to God the Father. If it is in God the Father's will that nobody be lost then guess what? Jesus won't lose a single believer.
Jesus will never LOSE a believer - that doesn't mean the believer might not walk away, if they become disillusioned with unanswered prayer, maybe.
People say, "if you love someone, let them go."
If you give a child permission and the ability to make their own decisions and they choose to live in another country, marry someone you don't approve of or take a job which is against all your beliefs; you haven't lost them.
If you keep a child locked up in their bedroom, giving food, drink and clothing because you want them to be safe, but no freedom; you will, eventually, lose them. Even if they're physically present, they will become resentful and only obey and say 'I love you' out of fear.
As Jesus does not fail, and yet he has clearly taught that some will end up in hell; choosing to walk away from God/block your ears so you can never hear, is the only explanation.
How many people do that, and how many don't accept him because of disappointment with their life, not getting to hear the Gospel etc, we don't know - only God can judge.