One possible observation is related to the concept we know of called cause and effect. In the natural world, every effect has a cause. A cause is responsible for an effect. For example, erosion (an effect) is caused by running water, wind or ice movement. If the big bang was the beginning of existence for everything in space and time as the theory suggests, there would have been nothing in existence to cause the big bang. If there is no cause, how did we get the effect of the big bang? If there was no universe before the big bang, what was the cause of its creation? Is it possible to have an effect without a cause? Is the big bang a natural event since it has no apparent cause?
It appears there are more questions than answers about this aspect of the big bang.