You didn't come back aggressively on Spectre8's comments, Jassy - you had no answer to her complaint. Yet her solution - choice - is identical to mine.
Where's the aggression? I'm asking a question that you seem unwilling to answer.
Spectre explained that her religious belief prevents her eating halal meat. Atheism involves precisely zero beliefs, so it is not an analogous situation.
I find it pretty tiresome when people try to tag their own personal secular values or preferences on to their atheism because it encourages the idea that atheism is a belief system with direct equivalence to religious faith, rather than the exact opposite.
My understanding from your posts is: your personal beliefs/values and your antipathy to religion mean that you object to eating meat that has had a prayer said near it, that has been slaughtered in a way you otherwise find acceptable. You don't believe that prayer has any value but you don't wish to facilitate religion or people practising their own religions through your own spending. (I assume you don't shop at the Entertainer, for example.)
So to fit your personal secular values (not a requirement of your atheism) you do not wish to buy halal meat, regardless of the method of slaughter. That meat exists in many supermarkets or restaurants, as pointed out upthread.
The choice exists. Exercising it involves a small amount of effort or a small inconvenience (eg choosing a pork or veggie meal in a restaurant serving halal meat, just as Muslims, Jews and Sikhs have to make other choices if they don't know the provenance of the meat, people concerned about fishing don't order fish if they don't know it's sustainable).
I don't intend any of this as aggressive. I'm simply trying to figure out where you're coming from, as a fellow atheist, because I don't think 'I don't want to eat halal meat' is inherent to atheism.