It is a wrong concept. Buddha did believe in G-d:
“There is, O monks, an Unborn, Unoriginated, Uncreated, Unformed. Were there not, O monks, this Unborn, Unoriginated, Uncreated, Unformed, there would be no escape from the world of the born, originated, created, formed. Since, O monks, there is an Unborn, Unoriginated, Uncreated, Unformed, therefore is there an escape from the born, originated, created, formed. What is dependant, that also moves; what is independent does not move.“—(Udana 8:3)
and
“The one who does not desire anything,
“But directly knows even the uncreated;
“Not satisfied, such a one breaks off any
“Possibility for rebirth by swallowing
“What he has made. Such one is the Supreme!”–Dhammapada 9
Buddha'd followers later forsake Buddha's teachings like the Christians forsake Jesus' truthful teachings.
Regards