Religion of Bobism? Well, there's always the Church of the Sub-Genius...

Seriously, though, my understanding (gathered from reading different sources) of what Sikhi believes/teaches about God/Waheguru/the Ground of All Being/choose your term is roughly the following:

There is only one Divine. Some religions use the name "God", some use "Allah", some use "Jehovah", some use more than one name, some use none. In all of these cases, what we have is humans trying to understand something transcendent and trying to explain something ineffable. The different portrayals and understandings of what the Divine is/does/wants are all reaching for the same thing, but nobody is able to fully understand it or explain it. We can't -- we're inherently limited. Our inability to do so doesn't mean the Divine doesn't exist, it just means we don't understand it.

An analogy that comes to mind is vision. As a human, I can't directly see ultraviolet radiation. My inability to see it directly doesn't mean it's not there, however, as I will find out to my sorrow if I spend too much time outdoors without sunblock.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/8536-who-is-god-in-sikhism.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=8536

I am a seeker and a student; if what I've said seems incorrect to anyone, please let me know -- I want to learn as much as I can and correct any misunderstandings I may have gotten into.