Is acting as if God exists while not actually believing that God exists functionally identical?

Is acting as if God exist while not actually believing that God exists is functionally identical or is that a sacrilege? To rephrase: is it feasible/possible/morally right to stick one finger in to test the waters or you accept Christianity in it's entirety and there is no middle ground? The reason I'm asking is that from the agnostic fence I've been sitting for the last 20-30 years of my life it seems that the satanic crowd have become increasingly active in the last decade or so and I want to have nothing in common with the Anton le Vei wannabees so am pondering my options spiritually-wise.