Unless we are able to discuss our faith rationally, we will be severely limited in our ability to share that faith with others, be they fellow Catholics, Protestants, Jews, Muslims, or agnostics. As an institution, the Church also needs to be realistic. While Catholics are discouraged from recruiting from the ranks of the churched, fundamentalist Protestants feel no such constraints nor do many in the New Age movement. Unprepared Catholics are susceptible to the arguments of well meaning Protestant evangelists or more rarely, new age religionists. Ex-Catholics account for 60 to 70 per cent of many fundamentalist congregations.
Catholic converts are rare by comparison.
Its because many fundamentalists recognize that many Catholics are uninformed and are ripe for the picking. Fundamentalists are on average much more familiar with scripture than are Catholics. They are trained to deconstruct the faith of wavering or casual Catholics. With some time and effort, Pastors can inoculate their Catholic congregations against blatant poaching. Most fundamentalists rely on canned presentations, similar to those of an Amway salesman.