God's Name Is Not Mentioned in the Book of Vester

The lack of explicit reference to god in the book of vester makes it a very controversial book. The early christian fathers, in deciding the bible canon had a really hard time with esther. It could be that those jews living in exile outside of the promised land legitimately had a hard time seeing god's hand in their lives. Could also be not wanting to upset the king by inflicting their jewish god on his actions.