On early Christian literature, in addition to the works on Church history, see especially the monumental Geschichte der altchristlichen Litteratur bis Eusebius, by Harnack (1893 ff.
The brief Geschichte der altchristlichen Litteratur in den ersten drei Jahrhunderten, by G.
New edition of the Apologists (unfinished; only Tatian and Athenagoras by Schwarz have yet appeared) in the Texte und Untersuchungen zuraltchristlichen Litteratur-Geschichte, Vol.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "altchristlichen" in a variety of sentences. We hope that you will now be able to make sentences using this word.