Why does Shakespeare use religious metaphors when Romeo and Juliet first speak?

Inof
, the lovers first meet use an extendedto compareto a pilgrim who is
approaching 's sacred shrine. In line 105, Romeo even says that he is acting out a prayer when
he kisses Juliet, and he says that "Now my sin has been taken from my lips by yours"
(line 106). To reverse that breach of a holy shrine and return his sin to him, Juliet kisses
Romeo again.

In one way, this scene can be read as Romeo and Juliet
blaspheming religion. They are pretending to be saintly while engaging in forbidden love that
their families don't know about. Part of why they use religious language might be to cover up
their sins with a religious overlay. In other words, they know they are doing wrong, but are
covering it up by pretending to be religious.

In a deeper way, however,
Shakespeare is conveying that Romeo and Juliet's love is pure. While their relationship bucks
the societal conventions of their day, they love each other, so their love could be seen
as...