"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.
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.
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.
They insist that the church sold them out — that the LDS leadership abandoned one of the religion's most
crucial theological tenets for the sake of political expediency.
The author identifies three ways of conceiving of marriage that emerge in
the theological tenets, political structures, and legal systems of Lutheranism, Calvinism, and Anglicanism.
As it happens, though, that IS a definitional list:
those theological tenets are what makes «Christianity» distinctive.