What is your favourite positive argument for atheism/unbelief?

[WinterHold]

Wherever there are strong hallucinating drugs, nothing can be trusted. The brain produces these; you can make sure by watching videos of dying people -people who got hacked alive or shot-; some smile and spit nonsense, they are hallucinating. 

As long as the brain is alive, it cannot be trusted. NDEs look similar because the drug the brain produces is the same.

Bolded mine.  What does that mean?

It's a near death experience; not "total death experience".

If the brain is alive, and it was proven that it produces drugs at the moment of death, or near death, and hence: the drugs produced indices hallucinations, then it cannot be trusted to tell what was real, and what was a production of the drugs.