Well depends on what you mean by “scientific”. Do I think modern science is capable of seeing anything beyond the testable and observable? No way, so there is nothing to determine a “why” with science alone. If there is an answer to why the universe began, I believe you’d have to ask the Infinite Void and hope for a response. According to the big bang theory we all came from one place, i.e. one “thing” created the entire universe, so only that “thing” would know “why” we were created.