Linguistic evidence: some terms were obsolete by 200BC.So they insist on a later date, after the events occured.
Unbelievers do not believe because it is supernatural.Prophecy of Daniel was proven accurate.Why do so Many Disputethe Authorship and Date? It will crush all those kingdoms and bring them to an end, but it will itself endure forever. Key Verse: 2:44 In the time of those kings, the God of heaven will set up a kingdom that will never be destroyed, nor will it be left to another people.To encourage us to be faithful to the end and overcome the temptations of this world and the antichrist.The kingdoms of the world versus the Kingdom of God.