For example, say there is a 28 year old Muslim woman living in Afghanistan. Her whole life, her family, friends, and community hashave told her to "stay away from those pagan Christians because they believe in three gods". So when she meets Christians that try to explain the gospel to her, she conciously denies it.
One day, on her way to volunteer for an orphanage, a man then viciously beats her to her death.
Is this woman's concious denial of the gospel a mortal sin that causes God to subject her to having her flesh burned forever and ever in eternal hellfire?