Religious parallels, sure. The Speaker even talks of the 'The Traveler' as a 'broken God'. But it only goes so far. Themes of light and hope against darkness and despair are pretty much embedded in the roots of every story in every culture. It doesn't make Destiny 'Christian' per se. In fact the notion that The Traveler came from beyond our Solar system to replace any previous concepts of Religion on Earth is anything but.