Where to begin ...
OK, I'll start here:
First of all, what's with the "R"? Is this like Toys-R-Us?

Atheists-R-Stupid. What, are you opening a store? Silly.
Next, it should either be, "atheists ARE stupid" or "an atheist IS stupid." We're talking basic SUBJECT-VERB agreement here. Grammar 101.
That being said, showing up on a forum of ex- and wish-they-were-ex-Jehovah's Witnesses and insulting atheists is not good form. In and of itself, I would posit that your choice of a JWN username is prima facie evidence of a cognitive deficit on your part. At the very least it shows poor social skills.
Finally, apparently you didn't take a minute and take the temperature of the room before you entered.
There are many here among us that are NOT atheists.
Get the clue.