But that word is used in the bible...

The word itself can be used to mean the following words: belief canon, conviction, creed, doctrine, faith, fanaticism, gospel, ideology (from dictionary.com)

And from the link below:
The word dogma (Gr. dogma from dokein) signifies, in the writings of the ancient classical authors, sometimes, an opinion or that which seems true to a person; sometimes, the philosophical doctrines or tenets, and especially the distinctive philosophical doctrines, of a particular school of philosophers (cf. Cic. Ac., ii, 9), and sometimes, a public decree or ordinance, as dogma poieisthai.

In Sacred Scripture it is used, at one time, in the sense of a decree or edict of the civil authority, as in Luke, ii, 1: "And it came to pass, that in those days there went out a decree [edictum, dogma] from Caesar Augustus" (cf. Acts, xvii, 7; Esther, iii, 3); at another time, in the sense of an ordinance of the Mosaic Law as in Eph., ii 15: "Making void the law of commandments contained in decrees" (dogmasin), and again, it is applied to the ordinances or decrees of the first Apostolic Council in Jerusalem: "And as they passed through the cities, they delivered unto them the decrees [dogmata] for to keep, that were decreed by the apostles and ancients who were at Jerusalem" (Acts, xvi, 4).

Among the early Fathers the usage was prevalent of designating as dogmas the doctrines and moral precepts taught or promulgated by the Saviour or by the Apostles; and a distinction was sometimes made between Divine, Apostolical, and ecclesiastical dogmas, according as a doctrine was conceived as having been taught by Christ, by the Apostles, or as having been delivered to the faithful by the Church.

http://www.newadvent.org/cathen/05089a.htm

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