In Star Trek: The Motion Picture, we see that:
V'ger is actually the Voyager 6 probe sent by NASA back in the 20th century. Decker "merges" with V'ger and together they become humanity's next "step" in evolution.
Do we know if/how the Q Continuum reacted to this? Is there any record as to how they reacted?
As Picard once theorizes (in TNG) to Q, he believes they were actually afraid of humanity. That at some point, humanity would "evolve even beyond the capacities of the Q". Q does not seem to take kindly to this "blasphemy". What Decker did would certainly qualify potentially as this evolutionary step. Yes?