I read about a Coptic Christian who was asked to renounce Jesus or his children would be tortured to death. (Muslim). He did and has been grieving since because he thinks he can’t be forgiven. That is clearly temptation beyond what almost anyone can bear.
Sounds a great deal like the priest in “Silence “ by Endo. God’s word is true and that man can be forgiven. Peter denied Christ three times and was forgiven.