Besides learning about his project online, I don't have any use of or interest in Khan Academy. There's no religion on my part, just a little disgust that a for-profit company would try to smear KA over minutia.

It would be like if Khan Academy was giving out free meals to homeless people and McDonalds fabricated reports on how the food was unhealthy and used their influence to get the Washington Post to carry the smear and add to it.

wrong and obtrusive concepts

Now who is showing a religious level of bias?

I'm a pragmatist. If something is free that I need, I use it. If something is for-pay that I need and the price is justifiable, I use it. My commercial software architectures often mix proprietary and open source solutions and I don't make excuses for either business model.

One thing about free, you can always get a refund on your investment and you have to really suspect the motives and the character of someone who attacks "free". Not real surprising that the attacker in this case was a for-profit competitor, was it?