Serious Question: What do you think the church is supposed to DO?
Plenty of non-profits exist that serve the marginalized in the world.
Meetup and community activities can help you find groups of people to "fellowship" with.
Professional and amateur musicians are ubiquitously available to listen to and experience beautiful art that makes you contemplative.
The Internet is chock full of TEDTalk style teaching that challenges and informs you.
You can find places to teach you meditation and centering techniques - yoga, raki, etc
You don't need to go to church to experience any of that. Many times, the church doesn't even do those things well when they try.
So, what is the church's DISTINCT calling? What about church is specific and NECESSARY to the world?

• The church is supposed to communicate the reconciliation between God and humankind that God has initiated in Jesus to humankind, to worship and praise God for that truth, and to encourage reconciliation among humanity.

• Right now, my answer is that the church is called to be an inbreaking of the realm of God in this world. To be the place where grace is practiced, where the image of God is recognized, where the Body of Christ can seek healing together. The church is called to be the place where barriers are broken, and all people can break bread together in compassion.

• Worship God. Not just contemplate, but actively praise and honor our Creator. The church creates a space for a relationship with the Triune God to be cultivated. That's the one thing I can think of that we do that nobody else does.

• The church is called to gather around the story of God and God's people, hear it, connect with it, and let it change them.

• I'm not sure it's about what we experience, or about what we "do" as an institution, but about who we are (and the doing flows out from that...).

• For me, the church isn't just a social advocacy group, a meet-up, or a education center. The church is a thin place, where we wrestle with mystery, feel rather than understand the presence of the past colliding with the present & future, and don't have to have all the answers even while we surround ourselves with wisdom. I don't always come out feeling peaceful like I think I'm supposed to with meditation, but I (almost) always come away feeling like an integral part of something so much bigger than I could ever really conceive.

• Yes -- it's orienting ourselves and our lives toward the Kingdom of God. Where we recognize that the Spirit strengthens and sustains us, that Christ dwells in us, and that everything we do should be rooted in God's love.

• I heard Nadia Bolz-Weber speak this weekend & she talked about this a bit- that there are lots of things our culture will take care of (things you listed- fellowship, care of marginalized,etc). Then she said: The culture will never proclaim the Gospel, administer the sacraments, and proclaim the forgiveness of sins--- that's the job of the Church. That's our job.
  The institution (how we do church now) can come and go--- but the Church will never die.

• We are called to share the good news, Christ and him crucified. That comes first, making disciples and baptizing the nations comes out of that. Everything else leads back to that.