Radical is a term that is used in a very negative way nowadays. If you live a radical life as a Christian, you are called a fanatic, but how does God want us to live, is He happy with a half-hearted commitment, the left-overs of our time and resources, a lukewarm lip service that does not require 100% commitment.
Revelation 3:15-17 I know your deeds, that you are neither cold nor hot. I wish you were either one or the other! So, because you are lukewarm—neither hot nor cold—I am about to spit you out of my mouth. You say, ‘I am rich; I have acquired wealth and do not need a thing.’ But you do not realize that you are wretched, pitiful, poor, blind and naked.
Matthew 7:21 Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven.