Scripture makes it clear that church membership is essential to experience the spiritual growth that comes by solid teaching and fellowship with other believers.
At the same time, I don't really have a big problem with a lot of the way my fellow young people look at Christianity (well.....have a serious problem with that Jesus is my homeboy shirt...blasphemous there).
I am super traditional (attend a church that even shuns old-fashioned hymns.....we only sing OT Psalms). But at the same time, I listen to contemporary Christian stuff elsewhere (the stuff that is not trite crap), and wear Christian t-shirts.
"Church membership" means being in communion with other believers. Two or more. That has been the interpretation I have been taught and believe.
(well.....have a serious problem with that Jesus is my homeboy shirt...blasphemous there).
That depends on what the wearer intends IMO. If it is meant to glorify God it is different than if it is meant to mock him. It won't be sorted out by us.