"Theological tenets" refers to fundamental beliefs or principles in religion. It includes the core ideas, doctrines, or teachings that form the basis of a particular religious belief system or ideology. Full definition
The core theological tenets of the church, as described by its theologians, consisted chiefly of three simple propositions: that Christ was fully God and fully man, that Christ was crucified to forgive our sins, and that men and women are sinners whom God loves and is giving new life. (religion-online.org)
In both countries, the judiciary, military and security apparatus jealously defended the basic theological tenets of the system, while the bodies of women were the primary arena of contestation: in Turkey, they were punished if they sported Islamic dress; in Iran, if they did not. (blog.politics.ox.ac.uk)
All of them, notably Barth, Brunner and Gogarten, hold the same theological tenets in so far as they are critical of the present religious situation. (religion-online.org)