During bibletime, god made it very plain that he existed. Back then, his existence was a fact of life, much in a "water is wet" sort of way.
Yet, his so-called followers kept changing gods all the time. We see this in exodus, where they build and worship a golden calf, even though they just witnessed an unambiguous miracle of god just a few days ago (or a few weeks; whatever). This is a theme in Judges, where god punishes his "followers" for abandoning him and worshiping new gods. Repeatedly. Heck, I think even Solomon fell into this trap, even though he had god-granted wisdom.
Keep in mind, all this happened while god's existence was obvious and unambiguous. Nowadays, god's existence is not obvious and unambiguous. We never hear god speaking to us, we never see unambiguous miracles today. Heck, his followers can't even agree on what his personality is suppose to be like. Kind and caring? Wrathful? There's like, at least 38,000 different answers.
So why do we not worship new gods every week? Why didn't we worship Baal last week, and worship Thor this week? Where are our plans to worship Apollo? When is "worship Ra week"? Why do we not see this sort of "worship chaos" like they did back in bibletime? You'd think that without god's continuous presence, things would be even worse, but it's not. Why is that?