Much of what passes for Christianity in America has become corrupted into a barely recognizable caricature of what it should be. Please read - Are We Finally Witnessing The Death Of Christianity In America? by Zack Hunt
The future of Christianity in this country isn't threatened by shifting demographics.
Of course, our own wonderful Catholic Women Priests (RCWP/ARCWP) are leading a small but growing movement to restore the gospel values of inclusiveness, collaboration, humility, simplicity, love and charity, to our faith.
The re-birth of Christianity may grow from our rejection of the failed and corrupted remnants of previous religious institutions. See the fascinating essay by John Pavlovitz for a vision of what the future of Christianity might look like - My Emancipation From American Christianity
If religion it is to be worth holding on to, it should be the place were the marginalized feel the most visible, where the hurting receive the most tender care, where the outsiders find the safest refuge.