In the very first revelation on the prophet in Cave of Hira, when the light (Gabriel) spoke the to prophet for the first time, I see a technical difficulty, when Gabriel said, God created man from a clot of blood. This is not true. Blood has no role in creation of human being. Why it was said, man was created from a clot of blood? This is surah 96 verse 1-3

Shakir
Read in the name of your Lord Who created.

Shakir
He created man from a clot.

Shakir
Read and your Lord is Most Honorable