Thats great..the Quran constantly refers abt disbelievers being in hell in the Quran,but scholars define disbelievers as the ones who reject God due to their arrogance or pride or due to stubborness.

ill refer you to watch a video in youtube - its name is kind of
is Quran the God's word - by zakir naik. its some 2-3 hr lecture,but it can make u understand most of the allegations against islam and its answers and hw Quran is GOD's word and that it can b from no1 else