I've read the Bible all the way through, several times. It's a fine example of what retardation was like 2000 years ago. Because you seem rather retarded yourself, I assume you're running MS Windows. Follow these simple steps and perhaps this will become more clear to you.
Open your start menu.
Type "calc" and press enter.
Type 666 into your calculator (unless you're scared the magically fantastical devil will get you).
Select "scientific" from your "view" menu.
Click on the hex, dec, oct and bin radio buttons.
Are you still feeling confused or will this induce a greater sense of your irrational "no, you're fucking dumb" brand of Christianity?
Many cultures thoughout our planets history have used a base 5 or base 8 system and others as well. Not all of them were down with the decimal system. If God is so special, don't you think that with his uber-magical powers that he'd have no use for a base 10 numerical system? Out of all the infinitely possible values, why would a lowball value of 666 be so special anyway? Is it because the retarded Christians back in the day couldn't count that high so 3 6's in a row seemed like rocket science?