How did God honor Daniel?

Biblical scholars note many historical errors in the Book of Daniel, which they now accept to be a second-century-BCE novel about events in the time of the Babylonian Exile. We repeatedly see the Jewish characters in the novel as being honest, brave and utterly faithful to their God. The non-Jewish participants are shown evidence of the power of the Jewish God until, uncertain in their own faith, they acknowledge his supreme power.

Leonard J Greenspoon (The Oxford History of the Biblical World, Between Alexandria and Antioch: Jews and Judaism in the Hellenistic Period) says the sudden changes of heart, through which foreign rulers acknowledged the sovereignty of God, did not really happen, but exemplify according to the authors what should be the reaction of all people when confronted by the faith of Israel.