Eye on Doctrine
For about 12 years, in the classes I taught at Trinity (TEDS), I suggested that the doctrine of the Trinity was going to be increasingly challenged in the 21st century.
The advance of Islam, the immigration of Muslim background people to the United States, and the lack of intellectual reflection by pastors in America on this core doctrine is leaving American congregations in a precarious position with regard to the defense of the faith.
An important new book on the issue is The God Who is Relationship, by Milt Rodriguez. An excellent and sympathetic review can be found at the following link: The Community Life of God