Sure, you have have a building. That building may have a steeple. But that's not the church. The church is the people. And guess what! People aren't perfect. Believers and non-believers, alike. Christians sin, too. A lot. And we struggle with really heavy things. Pornography (yes, even Christians). Jealousy. Depression. Dishonesty. Loneliness. This is why we need salvation. Because we're a broken people.