A massive god-entity that shows up and allows for people to see him. A voice sounding in everyone's heads, telling them that he exists. Half a million mango fruits being conjured from nothing.
If he's omnipotent and all-powerful he oughta bring more to the table than what we have so far - people's "experiences of god speaking to them". If I'd spend 5 hours a day for a year looking at a teapot I'd probably imagine it moving around by itself.