Altizer or the philosophical existentialism of Paul Tillich and eased the introduction of such ideas into the theological mainstream .
Altizer or the philosophical existentialism of Paul Tillich and made constructive evaluations , as well as contributions , to them .
Altizer or the philosophical existentialism of Paul Tillich and eased the introduction of such ideas into the theological mainstream and made constructive evaluations , as well as contributions , to them .