Why are evolution and creationism mutually exclusive?

Hey, im new to the forum.Being a biology student, but having many friends who are church going christians, ive always wonderd why Evolution and creationism are mutualy exclusive? Why can't they both, work side by side?Being from the UK, more christians muslims and Jewish people here take their respective holy book's view on a creation as a metaphor - I myself don't fall into any religious category (I'm definately not atheist, i think there is the potential for a higher power in some form).For example, the big big. A popular theory. According to this theory, a giant explosion caused all matter to be hurled appart which then swirled up into planets and then life came togerther on a planet (or planets) and evolved etc etc until we are here today.
Isn't it possible for the energy in the theorized big bang, to be a god?

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