That indicates, at minimum, that she did not believe the word of the Angel Gabriel who said that she would conceive by the power of the Holy Spirit. There was no need for a test. "Let it be done unto me according to thy word", makes that clear.
It's also suggestive of the idea that Jesus was conceived by sexual intercourse, which in turn requires that Mary was not a Virgin. This suggestion is strengthened by the fact that this same church has previously erected a billboard which showed an image of Mary and Joseph in bed after sex.
That fits my definition of blasphemy.
So it depends on what the viewer reads into it.