Not too fast .. apparently PhDs are well represented in the skeptic group; especially the hard sciences such as maths, phycics and engineering. It's something of a bath-tub curve for skepticsm: it's high at the lower socio-economic/lower educational attainment levels (I don't mean this in any pejorative/negative sense) drops as you go up the socio-economic/educational attainment curve, stays there at graduate/post grad level and then goes back up for PhDs. The belivers are well represented in the middle lumpen; the laptop warrior, credentialed, class who don't genuinely have to think for their living, or step outside of their cozy homes