This is a misunderstanding. It is not the god we are "against". It is the people who claim to follow one, and who do many bad (or dumb) things in the name of their god.
- The followers, not the god, are violating the constitution (in the U.S.)
- The followers, not the god, are persecuting minorities.
- The followers, not the god, are writing legislation forcing their "morality" on everyone else.
- The followers, not the god, are cheerfully marching the U.S. into the Dark Ages II.
It is the people whom atheists have to stand up to, not their invisible friend. We'd be having this same conversation if millions of Spiderman fans were doing similar things. Atheists frequently address theists' claims because it is a foundation to the reason why they continue with the above infractions.
Contentions with a group of delusional people is not an admission that their delusions are real.