[2] The Southern Poverty Law Center in 2011 described him as one of a core group of ten anti-Islam hardliners in the United States.

[5] Warner graduated from North Carolina State University where he got his PhD in physics and mathematics in 1968.

[9] American Muslim religious liberty lawyer Asma Uddin considers groups like Warner and his organization as anti-Muslim entities that mainstream the idea that Islam is not just a religion but also a political ideology which aids in legitimizing restricting the religious freedom of American Muslims.

"[14] The Council on American–Islamic Relations has described the CSPI as Islamophobic, listing it as part of the" U.S.-based Islamophobia network’s inner core".

Bronislav Ostřanský, a researcher at the Oriental Institute, ASCR, said that his apparently scientific approach impresses many people "including otherwise educated and politically influential personalities" but that he should be quoted "in a professional work in only one context, namely as relevant source material for the study of contemporary Islamophobia.