Howdy, Capri. Welcome to the AR. If you are looking for answers, you came to the right place. Amazing amount of collective knowledge in this joint. That being said, keep in mind I am just comedy relief around here, so I basically sit back and ride on the coattails of the intellectual heavy-hitters. Nevertheless, I do like to pretend to be smart every now and then, so I’m gonna take a crack at your very reasonable question in the hopes of bringing a bit of clarity to your confusion.
For starters, I would like to stress that my PERSONAL opinion is that EVERYBODY (atheists and theists alike) is Agnostic in regards to god(s). Sure, there are those who CLAIM to be gnostic, but how can they possibly PROVE their stance? Again, this applies to theists AND atheists. Now, with that in mind, allow me to reiterate. Others here have already explained the difference between Gnostic (Knowledge of god) and Theism (Belief in a god). Placing the “a” in front of either of those simply means “lack of”. Tracking so far?..
Okay, so, when somebody tells me, “I am a Christian, and I KNOW god exists,” that would technically make that individual a Gnostic Theist, right? But having questioned a few of these subjects over the years, it always ends up with them grudgingly admitting they DON’T really KNOW. And then they crawfish back to the standard, “Well, my FAITH allows me to BELIEVE god exists.” In other words, those who actually admit up front that they don’t really know (Agnostic theists), are actually more “honest” with themselves and others. Moreover, they actually consider themselves MORE BLESSED for relying strictly on their FAITH (believing without actually knowing). Of course, you also have those who say they believe ONLY because they aren’t sure (don’t KNOW), but it’s better to be safe than sorry (Pascal’s Wager. But that’s another discussion on its own.).
Anyway, hope that helps a bit. (Even though I basically just repeated what most here have already said. Still, like Cyber said, don’t go making this any more complicated than it really is. We already have plenty of theists ready and willing to do that for us. Simple is always better when it comes to this stuff. Remember, it ain’t rocket surgery.