Do you think IQ can be directly linked to Religious Beliefs/Denomination?

The problem with these studies is that all believers are included . Even ones living in third world countries where education is not available. When these same tests are given to atheists and believers in industrialized countries the results are dead even. Do you think IQ tests given to atheists in America and atheists in Ethiopia would produce the same results? Education DOES effect IQ scores. Contrary to popular belief, IQ's can and do change .