for me, religion is about following a script. it is ego food, but usually lacks substance.
Spirituality is about taking it upon yourself to discover the reality of this world.
religion tells you what is truth. spirituality is about learning what is truth.
first hand knowledge will change you to your core. that is what spirituality will do, when you take it upon yourself to ask questions and decide for yourself.
second hand knowledge will salve your ego, forever hiding the deeper meaning behind it. unless you go deeper, you will forever simply believe, but never really know.
some religions teach you to learn the truth for yourself, but even within religions such as Buddhism, there are those that simply stay on the surface.
But Buddha taught to not take anything he said as truth, unless you can prove it to yourself.
Christianity/Islam/Judaism all teach that their way is the only way, that it was handed down from God.. Therefor it is literally a blasphemy to disagree.
I do believe they all contain a kernel of truth, but it must be extracted. It is because they contain the kernel of truth they continue to be, but I feel unless we make it a point to cultivate our own personal religion, religion will not help you reach a deeper understanding of the truth.
In general, spirituality is about creating your own personal religion, it is filled with people that have forgone religion in favor of their own truth.