Nothing in the Gospels or Acts claim infalibility. Paul claims direct revelation, but has nothing to offer on the subject of Creationism. In addition, he apparently convinced The Church in Jerusalem that Gentiles need not heed the 'Law of Moses' such as circumcision and Kosher.He is rather adament in this position.
Further, Acts of The Appostles seems to be a commissioned research project. And there are TWO of them. The one in the New Testament is clearly a second draft sent to the benefactor. The first draft, however, was used in the Western Church for some time, and has been rediscovered. Among other things, it clarifies the entire hubbub with the Jerusalem church to total satisfaction.
I contend that almost NOTHING written after about the year 158CE has any sort of authority [the martyrdom of Polycarp]. This is the era when no one is left who even knew someone who knew Jesus. Accordingly, how is Augustine any less of a philosopher then the Agnostics?
In fact, the entire body of modern Christianity is one philosophical edifice of speculation piled on top of the rest. If you want to know the real and original Christianity read The Didache. It is the oldest known instruction manual on how to be a Christian. Very pragmatically it says to welcome into your community those who claim to be proffets. However, if they stay more then three days, or ask for money, they are false proffets.
Paul is the best witness to early Christianity. For examply, talking in tonques was VERY big at the time, but Paul cautions the congregations to limit this activity so as not to frighten the neighbors. He also admonishes those who arrive early to services and over indulge in food and drink [the mass, as we know it today].
Essentially, the entirety of Modern Christianity is one big circle jerk of philosophical conjecture. Mortal v. Veneal Sins? Predestination v. Predetermination. The Rapture. Prayer to release relatives from purgatory. I double dog dare anyone to find references to any of these things in any Christian writing prior to 165 CE.