Raised as a Methodist in Detroit, Michigan, Armstrong converted to non-denominational, Arminian evangelicalism in 1977, with strong affinities to the Jesus Movement and Messianic Judaism, and then to Catholicism in 1990, largely as a result of reading John Henry Cardinal Newman's Essay on the Development of Christian Doctrine.
[6] Armstrong's website has achieved notice in the Protestant community; its C. S. Lewis links page has been cited as a further reference source in the evangelical periodical, Christianity Today.
[7] Moreover, secular newspapers like the Los Angeles Times have cited the same Lewis web page.
[12] In 2003 Sophia Institute Press[13] published the first of its five Armstrong books, A Biblical Defense of Catholicism.
[19] Armstrong holds a Bachelor of Arts in Sociology (cum laude) from Wayne State University, Detroit, 1982.