Hello,
I’ve noticed that many Catholics and Orthodox quote the Church Father’s for backing up their teachings and faith. I have a fair idea of the definition of the Catholic Church (being founded by Christ, holy and aposolitic teachings that are infallible). My question is, are the Church Father’s writings and teachings considered infallible to Catholic Church? What makes a person a “Church Father”? Were they all bishops or priests? Thank you!
Lazerlike42 gives a good answer. I think it can be easy for some Protestants to get confused by the use of the Early Church Fathers, especially regarding the Catholic belief in Scripture and Tradition. Protestants know that Catholics believe in Scripture AND Tradition, so sometimes they mistakenly conclude that, for Catholics, the Bible =
Sacred Scripture and the writings of the Early Church Fathers =
Sacred Tradition. Then, they pull out the quotes from this or that Father that contradicts another Father or Catholic teaching as a means to “disprove” the infallibility of Sacred Tradition. The writings of the Early Church Fathers are
not equivalent to the Catholic idea of Tradition. Their writings also do
not form some sort of
second Scripture. As Lazerlike42 pointed out, they give us evidence of what the earliest Christians really believed.
I’m not sure the exact criteria to be a “Church Father”, other than the fact that they were Christian writers of the first several centuries after Christ who were not heretics.

I’m not sure if they were
all priests and bishops, but, offhand, I can’t think of any that were
not. You might find this article on
the Fathers of the Church helpful. This paragrapgh might go towards answering this question:
It follows that, as our own Fathers are the predecessors who have taught us, so the Fathers of the whole Church are especially the earlier teachers, who instructed her in the teaching of the Apostles, during her infancy and first growth. It is difficult to define the first age of the Church, or the age of the Fathers. It is a common habit to stop the study of the early Church at the Council of Chalcedon in 451. “The Fathers” must undoubtedly include, in the West, St. Gregory the Great (d. 604), and in the East, St. John Damascene (d. about 754). It is frequently said that St. Bernard (d. 1153) was the last of the Fathers, and Migne’s “Patrologia Latina” extends to Innocent III, halting only on the verge of the thirteenth century, while his “Patrologia Graeca” goes as far as the Council of Florence (1438-9). These limits are evidently too wide, It will be best to consider that the great merit of St. Bernard as a writer lies in his resemblance in style and matter to the greatest among the Fathers, in spite of the difference of period. St. Isidore of Seville (d. 636) and the Venerable Bede (d. 735) are to be classed among the Fathers, but they may be said to have been born out of due time, as St. Theodore the Studite was in the East.
Here’s some good websites that have the writings of the Church Fathers:
New Advent is good because, in addition to finding the works of the Church Fathers, you can also click on their name and it takes you to their entry in the 1909 Catholic Encyclopedia. That might be helpful to you if you’re looking for some biographical info on a particular Father.