First, I would do some church 'shopping' if you can. I belong to a liberal, mainstream protestant church (Evangelical Lutheran Church in America, if you want to know) and while we probably do more judging of the Obama-hating, SUV-driving, earth-destroying conservatives than we should, we try hard not to. We are active in ecological ministries, restoring wetlands, building for Habitat for Humanity, other outreach ministries. (We also have an awesome group of 40-50-60 something women who go out for drinks once a month of Friday! We went out last week, and I haven't laughed that hard in months).
One of our pastors is active in the Ecumenical Ministries of Oregon, and you can get a flavor of what they do environmentally here: http://www.emoregon.org/earth_concerns.php You might find out if there are churches in your area that have something similar and check them out.
My point is that there are churches with God/Jesus as their core and are more in line with your values. Have you ever checked out some of the more mainline protestant churches? All of these still focus on Godly redemption, but have a strong social justice focus in ways that newer and more conservative churches often don't: I would recommend:
UCC (United Church of Christ)
I've listed them in order of "central control" -- UCC churches are entirely locally controlled, the Episcopals have a rather hierarchical structure. Both ELCA and Episcopal churches tend to have more ritual in the service. Having grown up Catholic, I like that. People who come from a different tradition sometimes find it odd or hard to get used to. All of these churches differ from congregation to congregation. So, there's a lovely ELCA church not too far from us that's too conservative for me. (Oh, and just FYI, not all Lutherans are ELCA. Missouri Synod is more conservative and the rare Wisconsin Synod is even more so.) My sister and brother-in-law belong to a moderately conservative Presbyterian church. Their son is a pastor at a somewhat more liberal one. I guess my point is that you really have to figure out what that congregation is like.
Second, a book that I found incredibly interesting and helped me come to terms with some of my doubts/issues about my beliefs is "Saving Jesus from the Church: How to Stop Worshiping Christ and Start Following Jesus". It was written by a Methodist minister and he goes into the history of the term "Christ" and the centering of churches around being saved, and how the focus on Jesus as Christ takes away from understanding the rich and complex messages that Jesus gave as a teacher, healer and man who went against social norms. I found this book freed me in many ways to be able to focus on what I felt, in my core, were the important things about being Christian, and worry less about "being saved".
Now, I have to say, many denominations would find this book heretical. It will probably make many good, practicing Christians very uncomfortable. It may not be your cup of tea. But it may also open your eyes as to a new way of thinking about being Christian and new possibilities.
Finally, my question for you about staying in your church: Can you freely express who you are and what you believe in your church, or do you have to suppress part of you? If you have to suppress part of you, then it's not meeting your spiritual needs. What kind of community would meet your spiritual needs? (Not your social ones, but your spiritual ones?) What are you being called to do?