Challenges to the Church of the 21st Century

I am considering writing a series of articles that will discuss some of the challenges facing the church in the 21st century. While I have written about many of these issues in past articles, I thought it might be interesting to address them in a more organized, coherent format. Generally I’d like to use a format similar to:

Challenge - Overview of the challenge to the church.
Proponents - Where relevant, this would list the people who champion a doctrine that presents a challenge to the church.
Challengers - People who have challenged the proponents.
At Stake - Discussion of what is at stake.
Solution - Proposed solutions.
Resources - Recommended resources for learning more.

I will list a few obvious challenges and hope that readers will be able to propose some more:

Open Theism
New Perspective on Paul
Postmodernism
Biblical Sufficiency
Biblical Inerrancy

I am not sure how many articles I would like to write, but by drawing up an exhaustive list I can sort through and choose the ones that seem to pose the greatest challenge.

Your turn!