That's probably because the questions could have been worded a little better. i.e. the reputation thing threw a majority of the people who took the quiz off. You said so yourself.
As for the "When was CAG founded" thing should have been a little more lenient in terms of scoring. The CAG History states that it was founded in 2006. Here's the blurb from that.
"
Before the end of 2006 with the release of Rainbow Six Vegas, Kilo61, Delta Fox Trot 2 and I met Hawk CFO, MP Dobroski and EliteHooah. Together we started "MP" a Clan that would become even more notorious than "Delta" and would reach more than 400 Members within the first month of the Rainbow Six Vegas release. MP however would not last before the next Rainbow Six came and Ghost Recon Advanced Warfighter was released. A difference in play styles and personal matters prompted me to once again figure out a solution to keep the Core Members together and still united. It would not take us long to quickly agree on a new name for our Clan. Co-Founders Hawk CFO, YAEGEL and her Husband RANGERob80 suggested we use the name CAG which would first be known as Combat Action Group but was later changed to Combat Applications Group because of RANGERob80's real life affiliation with the U.S. Rangers. CAG is the name given to the United States Elite Special Forces known as "DELTA" and most of our Members had ties to the U.S. Military in real life. "
The roots go back to 2001 according to the site but the name CAG wasn't generated until 2006.Based off this blurb.