Please explain to me the Big Bang theory.?

The Big Bang Theory is a modern version of the Genesis creation myth. It was devised by a Catholic priest, Georges LeMaitre, and received the support of a god-fearing american scientific community in the early 20th century. Many contrary observations have cropped up over the years, prompting the invention of more and more fantastical concepts in a desperate attempt to keep the theory alive — things like expanding space, inflation and dark energy. There are a number of notable astronomers who recognise the absurdity of it. Some of them give their views in this documentary which you may find interesting...
https://www.youtube.com/watch?v=IFFl9S39CTM That video also highlights the shameful amount of bias that exists amongst the scientific community. The professionals have to do BigBang-supporting research if they want to keep their jobs. So there is, of course, a lot of research supporting the big bang. It is not so much the evidence that supports the big bang but the conclusions that are drawn by scientific consensus. [see www.cosmology.info]

The truth is that the big bang theory is severely flawed and will likely be consigned to the history books within a decade or two. There is an increasing weight of evidence opposing it.

The strongest contradicting observations are probably these:
http://www.sci-news.com/astronomy/science-universe-not-expanding-01940.html
http://www.thunderbolts.info/tpod/2011/arch11/110329redshifts.htm

...and here are some more:
http://phys.org/news190027752.html
http://www.moondaily.com/reports/Big_Bang_Afterglow_Fails_An_Intergalactic_Shadow_Test_999.html
http://www.spaceref.com/news/viewpr.html?pid=17752
http://www.dailygalaxy.com/my_weblog/2010/09/the-great-walls-of-the-universe-challenge-big-bang-theory-todays-most-popular.html
http://www.thefreelibrary.com/Quasar+clumps+dim+cosmological+theory.-a09364386

This page lists many deficiencies of the big bang theory:
http://www.metaresearch.org/cosmology/BB-top-30.asp

Alternative cosmologies that show some promise are the Plasma/Electric Universe theories:
www.plasmacosmology.net
http://www.thunderbolts.info/wp/about/syn/

Science can tell us what happened, but not why.

The evidence is that the universe started very small, and expanded (the 'Big Bang') very rapidly until it reached its present size.

Why did it do that? Nobody knows. If you want to see the hand of God there, then go ahead. But others may not necessarily agree with you.

Being a Christian has nothing to do with understandin or not understanding science. Unless you mean to say that Christians are less clever than other people. You don't mean that, do you?

The creation of the universe has nothing to do with the creation of the earth. They are totally separate events.

The <<universe>> began about 13.7 billions years ago. The exact manner of its beginning is unknown. There are various scientific hypotheses, but none has enough evidence to become the generally accepted theory. There is NO evidence of the universe being started by any super, all powerful thing - like a "god."

The Big Bang theory ONLY deals with the <<expansion>> of the universe after it started. That is a very common misconception.

The earth did not form until about 4 billion years ago. The only relationship between the formation of the universe and the formation of the earth is that the first had to happen before the second could occur.

The earth came into existence with the massive cloud of dust and gas that eventually became the sun and the planets of our solar system. That process is a well understood product of physics - gravity, conservation of momentum and various other things. Again, there is no need to suppose that it had to be created by some magical creature that controls everything.

You will understand the science behind the start of the universe and of the earth a lot better if you do not try to inject religious information or concepts into that process.

It is totally OK if you want to believe in a god. In fact the man who published the theory about the expansion of the universe was a Roman Catholic priest, and many religions are totally OK with the ideas involved in that theory.

Being religious (whether Christian or one of the other 5,000 religions that are practiced these days) does not mean you need to reject science. It simply means that you keep each side - religion and science - in their respective places and do not try to impose one on the other. That is where many religious people make problems for themselves - they try to force religion into a realm where it has no applicability, then get frustrated when it cannot be done.

Science actually demonstrates the amazing properties of what we see around us every day. Religion might allow you to appreciate those wonders more deeply or differently, but it does not prove or disprove anything scientific.

Current best guess is that a vacuum fluctuation created the universe. Vacuum fluctuations are typically associated with virtual particles that appear and disappear in our universe. Usually these things are responsible for creating matter & antimatter particle pairs that come into existence and then within nanoseconds they touch each other and are annihilated again. In this case, the fluctuation was one particularly big one, and it resulted in the creation of an entire universe, rather than just a few random particles! The vacuum fluctuations occur inside the quantum vacuum energy that permeates the universe, and probably all other universes too. The vacuum energy is probably shared by all universes, and is a property of the multiverse, which is the parent of all of the universes. The vacuum energy is evenly distributed throughout the universe at least on a macroscopic level, but at a microscopic level, there will always be a little bit of extra energy here and there than in other spots right next to it, because energy is always moving around, so sometimes energy accumulates a bit more in one spot over another.

So if the universe were created by a vacuum fluctuation, where did the vacuum fluctuation occur? Doesn't a vacuum fluctuation mean there is a space in which it can occur? Yes, it does imply that. It means that a space & time must've existed prior to the Big Bang. There must've been a parent universe from which our universe emerged. When people say that time and space didn't exist prior to the Big Bang, they are only referring to time and space inside our universe, since that's the only thing we can observe. There could've been a time and space that existed in a previous universe, but it is completely separate from ours, and we have no way of getting to there. So as far as we're concerned time and space only began existing after the Big Bang.

The earth wasn't formed in the Big Bang.