Can’t be anti-Christian - there were NO Christians in Noah’s time. Christianity is belief in Jesus Christ.
Nice try at word-play.
Your statement would be true if the movie were filmed in the days of Noah or at some other pre-Christian time. Like many other Hollywood offerings this movie is likely an attempt to undermine and dilute Biblical beliefs.
Biblical, yes; Christian, no. This (Noah) was in the Old Testament of the Bible; Christianity didn't come into play until the New Testament. So, the title should have read, "anti-Biblical".