Sometimes they get things a little backward, like this Thanksgiving sign: "Those who are thankful for little enjoy much." (Thankful for the little things? Or just not that thankful?)
Sometimes the signs don't make any sense: "Our Church is a PSL: People Serving Loving."
And sometimes, their slogans are downright heretical:

Isn't it weird that the church is honoring moms and denying the omnipotence of God in the same breath? And exactly where on the earth that God created is he unable to be?
Where can I go from your Spirit?
Where can I flee from your presence?
If I go up to the heavens, you are there;
if I make my bed in the depths, you are there.
If I rise on the wings of the dawn,
if I settle on the far side of the sea,
even there your hand will guide me,
your right hand will hold me fast.
--Psalm 139:7-10
If you also like really bad church signs, find all sorts of atrocities over at crummy church signs.