This is an unhappy expression, bringing in the name of God where it does not occur. In the O.T. it is chalilah, 'far be it.' Ge 44:7,17, etc. In the N.T. ?? ???????, 'let it not be.' Ro 3:4,6,31, etc.
By no means! God must prove true, though every man be false; as the Scripture says, "That you may be shown to be upright in what you say, And win your case when you go into court."
By no means, for then how could he judge the world?
Is this using faith to overthrow law? Far from it. This confirms the Law.