Why did G-d give us free will? Some people are born with neshamas that have a very strong affinity to spirituality, and are therefore naturally drawn to mitzvos and G-d. One who does not have that will not be drawn to it. Due to differences in how our neshamas connect to G-d, we are judged differently and held to different expectations. Whatever appearance you give to your neshama, you will live with in Olam Haba. What you do with yourself in Olam Hazeh is vital.