I have to strongly disagree.

I've met people who have never been in touch with organized religion. They generally have excellent ethical frameworks. I've also read the bible, it does not have a consistent moral or ethical framework.

How can it be that areligious people have ethics if they need god for ethics?

Ethics is all about being human, it does not require a god, and it does not require anyone to understand even what a human is, or what process led to us living life together. The subjective experience of life and the subjective experience of life in a society is all you need to develop ethics.

At this point theists often try to smuggle God back in as the source of morality through culture.

But I agree, empirically religion and moral behavior seem at best uncorrelated.

Bible is quite permissive of killing if it's in the name of god. Genocide is quite a recurring theme.