I just can't imagine a just God sending someone to Hell for not being a Christian.
More generally, the incongruity of the idea that a just God would send someone to Hell when they had never had the chance to to hear the message of Christ from him or his disciples is a principal reason I am a Universalist. (There are other possibilities that logically resolve that incongruity such as the possibility in Mormon theology that the dead can be saved in the afterlife, but Universalism is the one that seems most simple and elegant of those I have come across.)