Like the part where he says that he was at the "throne of God". Why couldn't he have said that he was at the "throne of Jesus"? No man has seen God, God is beyond all human conception and reason.
Another thing was the fact about how he spoke so openly to God. This was the major point which was so unbelievable, how arrogant he was when he first faced God talking about how much he though he pleased God. The humble, devout Christian NEVER thinks this way EVER, even if he were to endure death for Christ's sake. Also, if he really was in at the throne of God he would feel immense abasement and humility.
Then on top of that, he says that God told him that most people "think they're saved but they're not"... And then through all this i'm thinking, "What profit does it make for you to dwell ( and make us dwell) on other people's sins and how other people are going to hell?" It profits us absolutely NOTHING!!! God does not want us to focus on how the "97.5%" of people are going to hell, HE will take care of those 97.5% who are "going to hell". It makes no profit to us to dwell on others evil.
Work out YOUR OWN SALVATION with fear and trembling (phillipians)
I think this story was either made up in order for this book to be made, or it was a delusion caused by Satan
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Luk 18:9 He also told this parable to some who trusted in themselves that they were righteous, and treated others with contempt:
Luk 18:10 "Two men went up into the temple to pray, one a Pharisee and the other a tax collector.
Luk 18:11 The Pharisee, standing by himself, prayed thus: 'God, I thank you that I am not like other men, extortioners, unjust, adulterers, or even like this tax collector.
Luk 18:12 I fast twice a week; I give tithes of all that I get.'
Luk 18:13 But the tax collector, standing far off, would not even lift up his eyes to heaven, but beat his breast, saying, 'God, be merciful to me, a sinner!'
Luk 18:14 I tell you, this man went down to his house justified, rather than the other. For everyone who exalts himself will be humbled, but the one who humbles himself will be exalted."