Yea personally I'd give it like a 6.5 because I liked the symbolism and the movie overall, but it did drag for a bit in the middle and I think the last 20-25 minutes (specifically her getting beaten and stomped) kinda pushed the point to absurdity. That image towards the end plus setting viewers up to expect a horror...I can understand the negative reactions, though.
That ending was exactly what he wanted though, something absurd and over the top to show the extremes of each "part" of the puzzle from his pov...
[SPOIL]
=Humanity is a selfish race of people that is ignorant to the damage it does to "mother earth" and a benevolent God.
=A benevolent God cares more about the people he made than the Earth/Planet/World he has.
=Mother nature is dying because it has been abused and beaten and resculpted by humanity ("and" because God had done nothing to step in and help "it").
And there was countless more examples of xtianity/xtian people in the movie that you didn't state, including:
=The beginning of Bardem/God working/"making the earth in 7 days"
=Ed Harris is old/dying and "finally" a big fan/seeking God
=Humanity turned companionship(Eve for Adam) into a lust driven relationship
=All the sinning
=Inner religion wars/protestants vs catholics/sects vs sects (ending)
=Wiig/a bible writer-word spreader tainting a benevolent God's word into violence.
=The wake and wanting God to give them symbols, peace, and hope that the dead live on some how
=All the Bardem benevolent God-isms (longing for humans to love and need and want him, the endlessly helping people that disrespect him, "all" are invited into his "house", etc)
[/SPOIL]