You may be practical and logical but you are obviously not very well informed on the specifics of evolution. Evolution can and does occur very quickly at times, especially in lower life forms. Bacteria can evolve in a matter weeks or even days. Higher life forms, such as vertabrates, evolve much slower because their basic evolutionary form was determined in the earliest stages of their developement, when evolution was occuring at a much quicker pace. Most vertabrates for example, including mammals, have two eyes set in their heads, a mouth, four limbs, a tail and very similar circulatory, digestive, nervous and reproductive systems. This is a time-tested evolutionary form that has proven very dificult to improve upon. The more closely related two living things are on the evolutionary ladder the more similar characteristics they share. This in itself is further proof of evolution and is precisely the reason why we do not see mammals with a third eye in the back of their head or eight limbs. Viable evolutionary changes occur on a very subtle and gradual basis in long-lived higher life forms. All of the life forms that we see today fit into well defined evolutionary lines. If they had been created by some all powerful god some 4,000 years ago, he or she could have been much more creative, ignoring the basic laws of evolution and natural selection.
As far as the "big bang" goes, this in itself is an extremely christo-centric version of the origins of the universe....it assumes a single creation event. I prefer to think about it in terms of an endless cycle of natural expansion and contraction or a sort of bubbling cauldron of cosmic matter. An infinite number of universes are constantly rising to the surace and "popping" into existence creating endless ripples of galaxies which eventually collide an condense into a sort of "critical mass" which once again explodes into a wonderous new universe of it's own. This is a continous circle with no beginning and no end and is much more consistent with the observable laws of nature.