Also a huge NW fan. They (along with Sonata Arctica) were what got me into metal.
Musically, the album is in the same vein as Imaginaerum, with the massive orchestrations and being a little light on the heaviness.
Most of the songs are, as said before, on a positive swing about the beauty of life and enjoying living it to the fullest.
The last track is pretty epic, although if you take out the spoken word, the musical interludes, is only like 8 minutes of song. It really is an awesome song; Though it touches on the big bang, it is not of the same stuff that we would expect from the normally-a-huge-toolbag-to-religion Richard Dawkins
The other thing you should know about, is the second track, "Weak Fantasy." Nightwish has never written anything this blatantly anti-religious. There's just no misinterpreting the intent here.
I did not pick up that this song has an anti-religious meaning, so I guess it is open to misinterpretation

, or its pretty well hidden.... Though after consulting wikipedia, Marco did say something to the effect that it was about religion being too strict. There are some pretty heavy things said in the song, though.
I'd still say the CD is worth a listen. As a hardcore Christian and Nightwisher, I have no problem keeping the two separate. And seriously, its not like all NW songs are always controversey free. Think about some of their old stuff, which I adore. There are themes about sin, lust, hatred, you name it! Tuomas is just still such a BRILLIANT songwriter, and I'm still a fan.
There are some great songs on there too. My Walden and Our Decades in the Sun are really great.
AWESOME SIDE NOTE: At the Nightwish concert in Charlotte, NC recently, I bumped into/was right beside the one and only Matt Smith! We talked about their recent Progpower performance (which was the best concert of my life, hands down) and what he thought of the new direction of Nightwish. Headbanging the night away (Delain and Sabaton as openers too, woooo!) next to my musical hero was nothing short of awesome!!! Nighwish played some of their old songs, too (She is my sin, Stargazers, Ghost Love Score) which made me absolutely go bizonkers with happiness. I think they should re-record all their stuff with Floor.
Pic for proof!