The Principia Cybernetica says: "Occam's razor is a logical principle attributed to the mediaeval philosopher William of Occam (or Ockham). The principle states that one should not make more assumptions than the minimum needed. This principle is often called the principle of parsimony. It underlies all scientific modelling and theory building. It admonishes us to choose from a set of otherwise equivalent models of a given phenomenon the simplest one. In any given model, Occam's razor helps us to "shave off" those concepts, variables or constructs that are not really needed to explain the phenomenon. By doing that, developing the model will become much easier, and there is less chance of introducing inconsistencies, ambiguities and redundancies."
Other ways to present the principle:
"If you have two theories that both explain the observed facts, then you should use the simplest until more evidence comes along"
"The simplest explanation for some phenomenon is more likely to be accurate than more complicated explanations."
"If you have two equally likely solutions to a problem, choose the simplest."
"The explanation requiring the fewest assumptions is most likely to be correct."
"Keep things simple!"
So, if we take Occam's advice and slash away at the scientists' convoluted concepts about String Theory, M Theory, Multiverses, etc, the simplest purest unadulterated idea we are left with is ... God!