does big bang theory explain the origine of universe ?

That dependes on what do you understand as big bang theory (that has changed over time and improved). Because you wrote : if i will say to u that a bomb has been exploded and all things around that has been arranged in perfect way . will you be agree? i can say "NO" If you are unable to understand one thing and says that it is false, because of your ignorance on the subject, then what is the point argumenting? If you are interested I recommend : http://en.wikipedia.org/wiki/Big_bang http://en.wikipedia.org/wiki/Gravitational_singularity http://en.wikipedia.org/wiki/Universe And at last, the fact that we still don't know all the answers and that it is a possibility that we will never know doesn't mean that there is a god who created all (you can believe whatever you want, only please do not use science to justify your beliefs, your faith should be enough).

Can not say, because this is the most powerful concept that explain the origin of universe but there may be other theory which has not been improved yet. in future there may be new theory devloped which catch the faults of Big bang theory. till today this is the only theory that explains it most correctly.