I just wrote up a blog post on that 20% figure. The lovely Christian ladies have been busily fiddling the bean, it seems.
The poll was self selected using visitors to the Christianet website, and they defined "addicted" as "ongoing use of porn".
Does regular ongoing use of church services mean that half of America is addicted to church?
Time for me to link to
ExExExChurch again
I really must update that site soon.