Also, Nick, another exercise in contemplation:
Consider deeply that you are a series of atoms, consider how they are kept together, is it secure? Look within and see if they can come apart. Know deeply that they are individual particles, why do they remain together so you can be? Your lungs, heart, liver, stomach, brain, these are all made up of there own groups of particles, how?
Continue contemplating until they begin to feel like they are separating, what would it be like if they all fell to the floor? What remains if they did? Body is gone, brain is gone so mind is too, what remains?
This one scares a lot of people though, but it just occurred to me. Do not venture beyond what you are comfortable with, but if fear arises why has it arisen? Are you those atoms? What is special about these particles compared to those in the air or the furniture? Is this particular collection important to your own being? You can try again if you gain comfort.
I only recommend these because contemplation is the intellectual route, it is possible to arrive this way, but you will also see through these exercises if you commit to them that we are actually on the same route and that there is no difference in religions at all when you understand religion, when you understand what is involved with returning to the source.