what is there in universe before the bigbang ?

we are bound by time and space boundaries... try to think out of it you will get your answer:-)

What makes you think the scientists are right? All a scientist does is think up an idea and then do experiments to prove that the idea is right. If it cannot be proved definitively then it is just a theory and has no basis in fact. There is no way that anyone could prove that the universe was created by such a random act as the 'big bang'. Unless they can reproduce this big bang effect they cannot prove that that is how the universe was formed.

All the information that we have about the big bang and the evolution are just theories. This is a controvertible discussion between the Christians and the scientist. The best belief that we can have is that before everything there was something capable to create our world.