I happen to think that we can know the truth about some things easier than we can about others. You can't have a "round" square for instance, or there is a huge planet orbiting our sun at roughly 4.9 AU. I live with the notion that for the most part my senses don't lie to me, and they show reality as is... and where they do (as in extreme situations of relativity or quantum dynamics) I can build instruments that are better than me at seeing reality, but which my brain is capable of understanding. Reality is real. I am an atheist, and my ex is not, my kids will make up their own mind regardless of what I say, but I take opportunities to express my point of view (with as much respect as I can muster, and sometimes it's really tough, as when she expresses creationist views!). I cannot let superstition win by default. I also encourage them to think for themselves, so far it's worked, and they can tell BS when they see it or hear it.