Most people I've discussed God with, especially Christians in online forums, assume that I'm an atheist even though I no longer label myself that way. I ask a lot of questions about theism and religion and expect honest, sensible answers, but I don't tell them I'm an atheist. I also have what I think are convincing arguments that Gods are human creations and that miracles don't happen.
So what's going on with me? As odd as it might sound, in a way it seems that yes, I do believe in God. I was a Christian into my early twenties having been Roman Catholic and then evangelical. I don't think I ever completely shook all that indoctrination. Although belief in God is obviously irrational and delusional, there is a part of my psyche that includes some theism. Evidently human cognition can be inconsistent holding contradictory views. What we reason and what we feel can be quite different.
So yes, I think an atheist can believe in God. To smooth over that paradox, let's say that an atheist reasons that no Gods exist, but belief is another matter. So let me say that I'm a "rational atheist" in that I doubt God based on reason rather than lack of belief. Or to dispense with theistic labels completely, let's say I'm a "truth seeker" who has found that belief in God is to believe a lie.