Topics: Stories from Slate - Slate Magazine
In the New Testament , the term ἐκκλησία is used for local communities as well as in a universal sense to mean all believers.  Traditionally, only orthodox believers are considered part of the true church, but convictions of what is orthodox have long varied, as many churches (not only the ones officially using the term "Orthodox" in their names) consider themselves to be orthodox and other Christians to be heterodox.
The word is one of many direct Greek-to-Germanic loans of Christian terminology, via the Goths. The Slavic terms for "church" ( Old Church Slavonic црькꙑ [ crĭky ], Russian церковь [ cerkov’ ], Slovenian cerkev) are via the Old High German cognate chirihha . [ citation needed ]
Springing out of Second Temple Judaism , from Christianity's earliest days, Christians accepted non- Jews ( Gentiles ) without requiring them to fully adopt Jewish customs (such as circumcision ). [Acts 10-15]  The parallels in the Jewish faith are the Proselytes , Godfearers , and Noahide Law , see also Biblical law in Christianity. Some think that conflict with Jewish religious authorities quickly led to the expulsion of the Christians from the synagogues in Jerusalem  (see also Council of Jamnia and List of events in early Christianity ).