Is Shiva the supreme god in Hinduism?

Everyone believes that Shri Krishan Ji gave the knowledge of Shrimad Bhagavad Gita. The reality however is something else but even if we continue on this premise that Shri Krishan Ji gave the knowledge of Gita, then also there are numerous verses to consider from Shrimad Bhagavad Gita itself which prove some other Supreme God which Shri Krishan Ji refers to.