Is the current plan to take over human society by putting people under the complete domination and control of the alien Greys to be done through mind control manipulation to keep us complacent, control of us by force, or a gradual replacement of all human pregnancies with an extraterrestrial hybrid being that will be raised by the human parents as their own and humans being phased out?

All three scenarios will be proceeding in parallel, in addition to which, as you have seen, the voluntary cooperation and invitation of large segments of society is anticipated with the coming Disclosure Movement paving the way to dupe humans into believing they have an extraterrestrial savior. That will be the biggest and most devastating contributor to this scenario because human choice is paramount in governing what else might happen. The others are potentially correctable or preventable with divine assistance if requested. If humans voluntarily let the fox into the henhouse, divine realm can not jump in to save them.