Exactly. I find it very telling that the one line blurb that you get if you Google them, states that they are a "mainline" denomination. Who are they trying to convince? The truth is that they are just another wishy-washy, two-bit liberal/ecumenical group, with no real, uncompromisable, core beliefs, trying to make the rest of us believe otherwise.
In terms of membership, they are a relatively small group. They claim 800,000 members while the Southern Baptists claim 16 million, the Presbyterian Church USA claims 2.4 million and the Assemblies of God claim 1.6 million (to name a few). So the bottom line is - Who really cares what they think?
The PCUSA is also anti-Isreal. I left them for the Presbyterian Church in America 10 years ago now, it is refreshing to be in a church that teaches Scripture and stays away from social activism.