A benefit of converting to Islam is that God promises Paradise to the believer
Paradise, as described in many verses of Quran, is a place of eternal bliss & it is promised to believers. God shows his mercy to the believers by rewarding them with Paradise. Whoever denies God or worships something with, or instead of Him, or claims that God has a son or daughter or partner, will be doomed in the Hereafter to the hellfire. Converting to Islam will save a person from the torment of the grave, suffering on the Day of Judgement & eternal hellfire.
“And those who believe (in the Oneness of God) & do righteous satisfactory deeds, to them We shall surely donate lofty dwellings in Paradise, underneath which rivers flow, to live therein forever. Excellent is the reward of the workers.”