This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Linda Woodhead attempts to provide a common belief thread for Christians by noting that "Whatever else they might disagree about, Christians are at least united in believing that Jesus has a unique significance." Philosopher Michael Martin, in his book The Case Against Christianity, evaluated three historical Christian creeds (the Apostles' Creed, the Nicene Creed and the Athanasian Creed) to establish a set of basic assumptions which include belief in theism, the historicity of Jesus, the Incarnation, salvation through faith in Jesus, and Jesus as an ethical role model. Question: How many historical Christian creeds did Martin write about?
three