Okay, lets start of by first tyring to ignore what our good lord wikipedia has to say. i think we can both agree definitions of words are subjective, evolving, and varying? Right?

Now, I recommend you learn specifically what a gnostic is. The word gnostic is actually a word ascribed to the followers of Cain and the believers in knowing God's ultimate truth. That is to say gnostic does not mean "knowledge", it means "truth". Turth as in essence, ultimate truth, truth with a capitol t.
In that sense, I am also an agnostic, one who does not believe in ANy ultimate truths. However, thankfully, philosophy has developed a new way talking about this type of person... we call ourselves Ironists. Agnostic suffers from the same thing the word atheism suffers from, which is that the word itself comes from religious contexts. A gnostic, like i said, is a worshipper of Cain. So, why call yourself agnostic? The word atheist and the word ironist will suffice.