Islam contains a lot of contradictions and ambiguities within its scriptures (as does Christianity and Judaism). E.g. gender roles and justice can elicit competing interpretations among scholars of Islam. Not to mention the wide diversity within Islam - Sunni, Shia, Sufi, and other branches with differing doctrines.

Having been raised Catholic, then rejecting Christianity upon being confirmed in the Church and surveying the world's religions, I've found the Buddhist tradition to give the most satisfying and complete answers about these questions, with a minimum of contradiction. In truth Buddhism is less a religion and more a philosophy, which resonates with my 21st century sceptical self.

All that to say, I wouldn't put too much stock in 'the newest' religion, but rather consider that some group of people answered these questions when they were first considered, long ago. To my mind the Buddhists accomplished that feat.