It was you who introduced the "spiritual" term into the debate. If it is nonsense, take credit for it.
If the theist is the one who believes in God and the atheist is the one who does not believe in God, we must first know what is that god in which the atheist does not believe. There are two ways to do this: either ask theists or ask the atheists. The atheists will say, except for those in this forum, that they are very rare, that they do not believe in the god of theists. In other words, their definition depends on what theists say they believe. Except for the ones in this forum, which are very rare.
This is what dictionaries usually do: they try to get a standard definition by looking for traits common to all or almost all religions. That's quite difficult, because the differences are many. That is why, in the debates, it is convenient to use a slightly more precise definition depending on what is presented in the debate.
Where do you think you got that kind of definition you gave yesterday 09:22 PM: "god = a spiritual entity"?