CAN WE SAY SUCKS?

The pastor of this five year old church, with over 400 in attendance every weekend, says he came up with the idea one Sunday when a young woman came to him after service and gave him her verdict on her first experience of GracePoint - This church doesn't suck!
I love the idea, but I haven't quite worked out whether the word "suck" is permissible. Is it a curse word? Personally I generally veer away from it and say something stinks instead, but I must admit I like this advertising.
It definitely says something to the people this church is looking to reach.
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