An atheist is anybody who is not a theist and that includes the so-called agnostics.

It’s the theist’s job to define what they mean by “god” and to conclusively prove that such a thing exists. It’s not the atheist’s job to prove a negative. In other words, the burden of proof rests on the theist and on the theist alone.

and that includes the so-called agnostics.

I’d go a step further and call out the agnostics as being the dishonest ones. The reality is, you act on what you think you know. Theists and agnostics alike will still look both ways before crossing the street, because they already believe that there are no gods who will save them from being hit by a car. They wear jackets and pack umbrellas when it’s cold and rainy.

If you shall know them by their fruits, then I must say, I find the whole tree rather telling.

In addition to what Elwed and Patness said I’d only add that science is not a thing, but a process. It’s not something you can “know the whole of” because it’s not a thing, but a way of learning more about reality. The process itself can easily be flawed if the person doing the process assumes too much or allows their personal biases to get in the way. It is far from a perfect process, but it’s still the best one we have.

I’d go a step further and call out the agnostics as being the dishonest ones.

Like atheism, the definition of agnosticism is not universally agreed upon. However, the term is indeed tainted by allegation of intellectual dishonesty for refusing to call a spade a spade.

I don’t mind calling myself an apathetic agnostic atheist, though, just to cover all the bases: “I don’t believe, I don’t know, I don’t care”.

Double-dipping:

Top 10 Conversation Killers for Atheists

Note item 1.

There’s no proof that unicorns don’t exist either. Should I act as if there are unicorns lurking around the corner, or am I being more intellectually honest to declare that I’ll believe in unicorns when I see unicorns? On the other hand, I don’t know the sun will rise tomorrow. I’ve got a lot of good reasons to, so expect that it will. All the reasonable expectations of god rest in unicorns, and all of the reasonable expectations that the sun will rise tomorrow are with science. Therefore, I trust science.

There’s not just a lack of proof of the divine, there’s a plethora of argument and experiment against it. There is no such thing as the supernatural outside of fiction.