The most insanely daring thing that any man can do, the most exceedingly foolish thing any man can do, the most desperately wicked thing that any man can do, is to reply against God, to enter into controversy with God, to criticize God, to condemn God …Job did it and was still forgiven. Also consider the meaning of the name Israel.
And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.The unpardonable sin is what men need to worry about.
—Luke 12:10
Job complained a lot but never condemned God. That is what Satan wanted Job to do but he did not.
From time to time, when I look back and remember, I worry that i have already committed the unforgivable sin. Many years ago I was driving my car home and getting upset about something and wished that I wouldn’t feel any conviction because it was keeping me from doing/saying something I’d wanted to, but would regret. Like, I actually was resenting the fact that I had the Holy Spirit in me, at that moment :( because it felt like a burden.
I think one of the lessons from the Book of Job is that God does not answer “why” questions.