I do not have any problem with people believing whatever they believe, I have simply never been convinced to accept the claims about the existence of any God - so I remain an atheist.
I have never encountered any evidence to support the claims of alleged "supernatural events". As far as I can see the ratio of failed predictions to the ratio of correct ones is consistent with random chance. If you know of some actual empirical evidence that supports claims of the supernatural then you should reference the link.
I think Jesus was an ordinary man. I am not convinced that he performed any miracles, and it is possible that he simply survived his crucifixion, some people did apparently if the crucifixion was stopped before they had died. In fact there is an ancient historical record of one person who survived a crucifixion that was intended to be lethal, but that was interrupted. The historian Josephus recounts: "I saw many captives crucified, and remembered three of them as my former acquaintance. I was very sorry at this in my mind, and went with tears in my eyes to Titus, and told him of them; so he immediately commanded them to be taken down, and to have the greatest care taken of them, in order to assist their recovery; yet two of them died under the physician's hands, while the third recovered."
It is quite possible that the account of the death of Jesus on the cross was actually a case of trauma induced coma (which closely resembles death) being mistaken for death.
The "prophesies" that were supposed to be about Jesus are part of a set of predictions from the Jewish beliefs about a Messiah (in Hebrew: מָשִׁיחַ; mashiach, or moshiach, simply means "anointed [one]" since priests and kings, were traditionally anointed with holy anointing oil as described in Exodus 30:22-25) however the term came to refer to a future Jewish Priest-King from the Davidic line, who it was predicted would be "anointed" with holy anointing oil and rule the Jewish people.
The predictions or prophesies in the Hebrew Bible regarding the mashiach were *not* fulfilled in the Jewish view so It would seem that there is some controversy on that point. In fact according to Maimonides, Jesus of Nazareth is not the Messiah, as is claimed by Christians. and while he mentions about two chapters of his Mishneh Torah, a 14 volume compendium of Jewish law, one of the more significant points of dispute would be that "There will be no more hunger or illness, and death will cease" (Isaiah 25:8) although there are some 118 other very significant prophesies that would need to have been fulfilled within the life of Jesus including the return of the members of the Hebrew sons of Gad to their homeland (Isaiah 11:12).
The meaning of the word atheist is simply someone who does not believe in any God. We have no other set of beliefs - it is not a religion, it is just a way of describing someone, like saying they have brown eyes or like to watch football.
Not every atheist actually accepts either evolution or the Big Bang - Just as many Christians actually do accept these things - including the leaders of both the Anglican and Catholic churches.
For atheists it is really pretty simple to understand. Since we do not believe in any God, quite naturally we do not have a "creation story", and as a consequence we typically accept the explanations for questions like "how did the Earth come to exist?" as are offered by science.
Unfortunately a detailed answer cannot be provided here in the available space. But if you are serious and you really want to learn about the scientific explanations that most atheists accept, then you can get a nice summary from this link; http://en.wikipedia.org/wiki/History_of_the_Earth