Kreeft regards Protestants warmly, believing that Catholics can learn from them.
“Until Catholics know the Bible better than Protestants do, and until they know Christ, both personally and theologically, better than Protestants do, there is no reason why God should end the Reformation and make all Protestants come back home,” he said. With this mentality, he has made it his mission to unite Christians of different denominations.
Source: Thomas Keenan - Catholic Author Peter Kreeft: To Save Your Soul, You Must Opt Out of the “Culture of Death” - See more at: http://aleteia.org/2014/10/22/catholic-author-peter-kreeft-to-save-your-soul-you-must-opt-out-of-the-culture-of-death/