Lumifer comments on Open Thread May 23 - May 29, 2016 - Less Wrong Discussion
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It is my understanding that due to ethical concerns, the scientific field of psychology does not have a data collection methodology capable of distinguishing between effects caused by the parents' genes and effects caused by the parents' actions, and as such, no possible statistical approach will give a correct answer on the heritability of traits caused by the latter, like schizophrenia a.k.a. religion or intelligence. In order to clear up my "misunderstandings and ignorance", you will need to demonstrate an approach that can, at the very least, successfully disprove genetic contribution in circumcision.
Your understanding looks silly. It is rather obvious that not all children are brought up by their parents and that has been used in a number of studies. In fact, many classic identical-twins studies rely on being able to find genetically identical people who were brought up in different circumstances (including different parents).