Tentmaker Ministries – A large website full of articles, online books, and other resources promoting Christian Universalism. Christianity as the Universal Religion, Chapter Eight in Stephen Palmquist, Kant's Critical Religion (Aldershot: Ashgate, 2000) – Demonstrates that the 18th century philosopher, Immanuel Kant, regarded the Christian religion as the only "natural religion" that has the potential to be spread to all human beings. Evangelical Universalism – A website with articles, books, and other materials promoting the biblical doctrine of Evangelical Universalism.