Quantum mechanics allows any situation to happen .There is a tiny probability you can put a finger through a concrete-wall, etc
furthermore in Mathematics,zero probability does not always indicate that the event will not happen, this is a common misconception. If we're talking about continuous variables, probability is defined as a measure and the measure of a finite set is zero.
though these probabilities have nothing to do with practical expression but my contention is that all atheist community including scientist take their position about existence of God on certain things which do indicate the probability of a supreme being instead.
