I'm glad you've changed your stance!
As for Maiden being Satanists, that was an old rumour which started when they released “The Number of the Beast” but is really just bollocks. I think this quote from Steven Harris says it all “"It was mad. They completely got the wrong end of the stick. They obviously hadn't read the lyrics. They just wanted to believe all that rubbish about us being Satanists.". According to Steve, “The Number of the Beast" was inspired by a nightmare he had after watching Damien: Omen II and also influenced by Robert Burns' “Tam o' Shanter”. Last but not least, the band’s drummer, Nicko McBrain, is a born against Christian.
Since you like the new album, I really think you should check out some of the old material. I refuse to believe that you won’t find something you like. At fist, you might want to avoid “Iron Maiden”, “Killers”, “The X Factor” and “Virtual XI “ as those features other singers, which might put you off.