Why would a person being brought up with a belief that is against the Creator's Will when we as muslim don't have to deal with such a situation?

It is an extreme fact that very few people of other faiths are seen to convert to Islam. This means that converting to Islam is a little harder than usual for those of us who were born into a muslim family.I do not believe that Allah 'azzawajal has done injustice to them because I know from Allah's attributes that Allah is not unjust. The answer I really want to know is why would a person go astray on such an important issue early in life and why would he live with a belief that is against the way of our only true Creator(Allah 'azzawajal) when we do not have to deal with such a situation? This ia the question that i've in my mind as well as some friends of mine have asked me this and I've no answer.....so I want you to elaborate this with deeper logic and evidences from the Qur'an and authentic aahadith!