Habermas is Distinguished Professor of Apologetics and Philosophy and chairman of the department of philosophy and theology at Liberty University in Lynchburg, Virginia. He holds a Ph.D. (1976) from Michigan State University in the area of History and Philosophy of Religion and an M.A. (1973) from the University of Detroit in Philosophical Theology. He has specialized in cataloging and communicating trends among scholars in the field of historical Jesus and New Testament studies. Habermas has authored or co-authored 35 books on religious and philosophical subjects, contributed to over 60 chapters or articles in books, and published over 100 articles and reviews in peer-reviewed journals. He continues to do research, publish popular and academic papers, give debates, and he frequently appears on television.

In 1985, Dr. Gary Habermas and Antony Flew debated the question of Jesus' resurrection as a literal and historical/physical event, before a crowd of 3000 people. Five philosophers and five professional debate judges judged the debate. Of the philosophers who judged on the content of the debate, four voted that Habermas won and the other was undecided. Of the debate judges who voted on debate technique, three voted for Habermas while two voted for Flew. The debate was published as a book under the title Did Jesus Rise from the Dead? The Resurrection Debate (Harper & Row).

In 2004, Habermas conducted an interview with Antony Flew published in Biola University's Philosophia Christi journal, in which Flew reversed his long-standing espousal of atheism by endorsing deistic theism. The interview has been the source of some minor controversy, centering on claims made in the interview's preface regarding the scope and nature of Flew's beliefs, and his subsequent contradictory statements endorsing atheism, the latter being a misnomer, for Flew clearly no longer supports the inference or verdict of atheism, but rather the evidential method or route by which one may secure such a verdict, i.e., the "Presumption of Atheism" is default, nullified only on the condition that the degree of proof is met.