Are sure you want to stay with "every" Christian group before Luther? This means there was no dissent at all from anyone.
If you're sticking with that claim proof is required to back it up.
Not how it works bud. You can’t create a claim there were dissident groups and them ask me to disprove your claim. Mainstream history proves there were no dissident groups at that time that were of any significance so as to be mentioned in the historical record. Gussied Cassava are proto protestants. Moreover your little gotcha question proves that the view that Mary was not always a virgen is a dissident position ie not accepted by the group.