How does art serve a functional purpose for many places of worship?
a.
it decorates religious buildings which would otherwise be plain and uninviting.
b.
it provides a connection and reminder to its patrons of their faith and god(s).
c.
it allows artists to display their work in a public place in order to further their career.
d.
it accomplishes all of the above.

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.