To evangelize is good, to proselytize is bad.
Most people are obviously far more anxious to express their approval and disapproval of things than to describe them. Hence the tendency of words to become less descriptive and more evaluative; then to become evaluative, while still retaining some hint of the sort of goodness or badness implied; and then to end up by being purely evaluative – useless synonyms for good or bad. —C. S. Lewis, Studies in Words