If you base your belief on the current scientific understanding then you are an atheist. You can't deny or believe in anything outside of what can be observed and tested through the scientific method. So you can't claim anything outside those parameters.
Science and islam are not mutually exclusive. And scientific models always change when we find new evidence, so it is not an understanding of the reality, but our understanding of the reality with our limited intellectual capacity. And that innate capacity, to our understanding, is the biggest blockade to unraveling the truth about absolute reality. But we are getting in a weird direction. The universe is proving to be more refined, random and infinitely complex at the same time, when you study quantum mechanics. Scientist won't utter the words 'grand design', but their evidences are pointing in that direction. Also, the more we find new knowledge, the less we really understood things to begin with, like the wave/particle duality.