It's hard to pinpoint a definition for religion.
Does that imply some kind of practice ? Does that imply veneration ? Does that imply you hold something sacred ? Does that imply you have dogmatic principles ? Does that imply you have a mythology ? Does it mean you need a crowd ? Do you have an external reference driving your conduct, your view of the world, your morality ? And most importantly, should they all resolve around the same source ?
Having a life phylosophy doesn't seem to be attached to most of those, and doesn't limit itself to one source. And a lot of those don't seem to necessarly imply a life philosophy.
Besides, there is a huge difference between religion as it's designed, and religion as it's lived. Not to mention people of the same religion disagree on the living AND on the design part.
But I do agree with you on one point: religion used to answer to those pesky deep life questions for everybody. Now that our source of points of view is much broader, we do miss the easy sense of purpose that was provided by many religions.