What is the Hindu god who created the universe?

according to Hinduism lord vishnu is the creator of universe......in ancient times there was great rival that vishnu is the great god and some said lord shiva is the great power. but when one goes into depth of the olden writings and truth it is true that lord vishnu and shiva are the same...........the universe was not directly created by lord vishnu....the myth says that lord vishnu gave birth to lord brahmma from his naval.....lord brahmma is the lord of creation........lord brahmma decides fates of all the things in the universe ....he is still running the universe making changes like birth,death,creation,destruction................etc