Authenticity Of Kalima Tayyiba

I am a student of the Qur’an and have few questions for you. But at this time, I would like to have your thought and guidance only on the following questions.

1. Nowhere in the Qur’an I found the First Kalima. Do you think Allah (God forbid) forgot to mention it or it is we who ignored the real Kalima from the Qur’an and invented something for ourselves? The first Kalima is called Kalima Tauheed. But with all honestly, I do not think that the first Kalima is a Kalima Tauheed because it includes two entities (Creator and one of his creatures, i.e. Allah SWT and Muhammad (sws). It is also a violation of the Qur’anic teaching when God says “do not make distinction among my messengers”, and yet we pick one Prophet and include in our daily prayers. It seems the Islamic world has abandoned and forgotten God's true message and started worshipping the messenger.
2. Hadiths have contradictions and included a lot of non-sense. I believe it can't be a source of Islamic laws and has very little, if any, to do with the Prophet (sws). Then why we put so much emphasis on it when we talk about Islam? Is Qur’an not clear, complete and fully detailed book?
3. Almost all Islamic duties (Ibadat) came through Prophet Ibrahim (sws) and at the time of Ibrahim A.S, Prophet Muhammed (sws) did not exist. Then why we say Durood-e-Ibrahimi in our prayers? Our Ibadat/Namaaz must be fully devoted to Allah ONLY. None of His creatures should be part of our Ibadat/Namaaz.
4. We conclude that al Prophets were pious people and guaranteed Jannah. Then instead of worrying about our own neck, why we say Durood-O-Salaam to the prophet, day and night? It is shirk (polytheism) and against the teachings of the Prophet. Is it not? I expect a comprehensive and logical answer.
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