All 3 Uses

theology
in
Anna Karenina
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She knew, too, that he was really interested in books dealing with politics, philosophy, and theology, that art was utterly foreign to his nature; but, in spite of this, or rather, in consequence of it, Alexey Alexandrovitch never passed over anything in the world of art, but made it his duty to read everything.†
Part 1
She knew that in politics, in philosophy, in theology, Alexey Alexandrovitch often had doubts, and made investigations; but on questions of art and poetry, and, above all, of music, of which he was totally devoid of understanding, he had the most distinct and decided opinions.†
Part 1 *
His brother Sergey Ivanovitch advised him to read the theological works of Homiakov.†
Part 8

theological = relating to the study of religion

Definitions:

(1) (theology)
the study of religion; or a particular system or school of religious beliefs
(2) (meaning too rare to warrant focus)