No.
If you're not convinced a god exists you're atheist, plain and simple.
Now, you can be a hard atheist where you know a god doesn't exist, or a soft atheist where you don't know.
Knowledge is a subset of belief. A belief when you have strong evidence is knowledge if you will. Like science.
Because one cannot choose a belief, you either are convinced or not, you can't really be on the fence.
You're confusing belief with knowledge.
If you don't believe in a deity, guess what, you're an atheist regardless of whether you know for sure a god doesn't exist or not.
Most atheists are agnostic because it's not on us to prove that a god doesn't exist, no one should ever take the burden of proving a negative.