Many Christian apologists use some sort of argument from authority to support their claims. For example, scripture and/or the teaching authority of the church leaders through tradition are common assertions. This blogger has previously posted on the subject here.
Below is an example of how the Catholic Church has discredited itself as an authority on reality.
To be taken seriously as an authority, an institution must be at least consistent with known science and reason. Virtually all religious authorities fail in this regard.
A final thought: Ironically, the above quote actually supports the claim that Jesus was not born of virgin. This from an authority of the Catholic Church. Is this the type of evidence upon which you want to argue from authority?