When I was teenager and working in restaurant like most teenagers, my boss told me a story about his philosophy class. In his final exam, his philosophy teacher asked only one question: Why?
Every student started pondering and writing various existential stuff for the whole duration of the exam, except one guy, who scribbled something and left the room after a few minutes. Turns out that guy got the highest grade for that exam, and his answer was: Why not.
Philosophers (and scientists) tend to get absorbed in their technicalities and semantics that they lose the audience after a few lines. It's true, I used to have very long and deep discussions with my friends at university, discussions that often led to other thoughts completely unrelated. Or were they? Everything in the universe is connected one way or another, it's no surprise that thoughts may seem mixed up at first, but at their basics there's always something common connecting them. It's the interpretation that differs from one person to another, which can lead, as you mentioned, to religious clashes and wars.
"You do not really understand something unless you can explain it to your grandmother." ― Albert Einstein
Awesomely put