Doctrine, sometimes called "dogma" simply means "teaching" or what is taught.  In Christianity, as in most other religions, such teaching has become formalized and structured.  It has been segmented into different compartments, usually by topic or theme.  Here then, are some essays and lessons.  Hopefully, they will prove educational and enlightening to you, the reader and student.

Christian

    About Praise  (when not to practice the 3 "R's")

    How Many Ways  are there to be justified?

    On Eternal Life  (Where will you be after you die?)

    On Eternal Life  (Will the unsaved suffer torment for eternity?)

    Divorce and Remarriage  (Are they permissable?)

Islam

    Islam's Curious God  (To Whom--or What--do Muslims bow down?)