The upcoming Noah film is being produced in a style that feels like an epic fantasy movie just like LOTR or others. Based on what I've read and seen it is not trying to be utterly faithful to the Biblical account, and so even if you believed this was really a true story you could see this as a fantasy take on the story.
The movie is starring Odin, Van Helsing, Hrothgar, and Hermione Granger. We MUST make it on-topic.
On a more serious note, I think the general Meta consensus is that if the writer INTENDS the story to be fiction (e.g., the story of Christ in "Master and Margarita" by Bulgakov; or Marvel's Asgardians); it's SFF. If it's merely a movie about a religious event ("Passion of Christ" by Mel Gibson; or hell, Charlton Heston's "Ten Commandments") it's not.
Based on Wiki info, it seems to be the former. E.g.
In October 2012, Emma Watson commented on the setting of the film: "I think what Darren's going for is a sense that it could be set in any time. It could be set sort of like a thousand years in the future or a thousand years in the past. [...] You shouldn't be able to place it too much."
In other words, the events described in the Bible are merely used as an excuse to tell a dramatic story that Aronofsky wants to tell, set in an special setting.
That should make the movie on-topic in general.
CAVEAT: Questions that ask about movie events based on discrepancies between the movies and Bible, or questions whose answer is expected to be based on Bible text or Biblical scholarship (as opposed to movie script) should probably be offtopic.