"
rushing over (out of) me,
And the crashes are heaven, for a sinner like me,
But the arms
The crashes could mean the striking waves. The symbolic and spiritual meaning of the ocean is a washing soul experience, when you drown yourself in it, greatness/god embraces you, for a "sinner like me", it's clear that she finds redemption at every aspect of her experience in the sea.
Pardon my English, it isn't my maternal language.