I

is a woman who is traditionally and legally married but not wedded in church recognized as being sinful before God

I think sometimes we trouble ourselves with far too many religious bottlenecks than are necessary.

If two people come together as one and get married, let us learn to respect and value that tie as a legal/legitimate marriage. Asking whether the marraige took place in a 'church' is unnecessary - we could as well question the validity and legality OT marriages since people like Abraham still married long before the Church existed.