I first recommendation would be that, rather than calling them Skills and Knowledge Skills, to just use the term Skills and Knowledges. Thus, Skill Points and Knowledge Points. It'll probably save some confusion in the future.

Second, you mention that you never get to a point where you auto-succeed everything, although with Superhuman rank certainly seems like you'll auto-succeed everything. I'm not sure if this system helps the "either auto-pass or auto-fail" problems the currect 3.5e system has in regards to skills.

What happens when two characters make opposed skill checks, such as Stealth vs Perception? Does the one with the higher rank auto-win, every time? Do they both roll d20 and compare, with the standard DC 12/20 difficult determining if one character fails?

Why are Identify and Spellcraft "Active Skills" as opposed to Knowledges?