What's going to happen next: AI-technocracy religion, to "unify" (i.e. kill off) all other religions or to marginalize them into small enough position as to not matter.

You are completely correct. The anti-Christ will make a dystopia for all. He will feign being some great person for half his reign, then later on, reveal his true form and go on murder sprees that would make the worst genocides in history look like puny squabbles.