To all intents and purposes I am an atheist but strictly speaking I'm an agnostic.
Nobody can prove or disprove the existence or non-existence of a deistic God, so there's doubt. But the overwhelming probability is that Einstein's god (the one who doesn't play dice) doesn't exist.
When we are talking about a theistic god we're on firmer ground. Jesus was not the son of God, the Jews will wait in vain for the second coming and Mohammed invented the verses in the Koran.
I don't believe 'something came from nothing' I know that the current state of scientific thinking can take us no further back than the Big Bang.
I also know that just as Einstein's model of the Universe supplanted Newtons, current orthodox thinking will be modified as we learn more.