Stephen Prothero author of "Religious Literacy", on whether all religions are the same:
If you ask something simple like, "What is the problem that Christianity solves?", the answer would be sin. If you ask what problem Buddhism solves, the answer would be suffering. Are sin and suffering the same? No, in Christianity suffering is in some senses a good thing, in Buddhism there is no sense in which suffering can be considered good.
So I think different religions are not different paths up the same mountain but have mountain climbers climbing different mountains with different treasure chests at the top.