Over the last few decades many Catholics have left the Church, many dropping out of religion entirely, many joining other churches. But the traffic has not been in only one direction.
The traffic toward Rome has increased rapidly. Today we are seeing more than a hundred and fifty thousand converts enter The Catholic church each year in the United States, and in some other places, like the continent of Africa, there are more than a million converts to the Catholic faith each year. People of no religion, lapsed or inactive Catholics, and members of other Christian Churches are "coming home to Rome."
They are attracted to the church for a variety of reasons, but the chief reason they convert is the chief reason you should be Catholic: The solid truth of The Catholic Church.
Our seperated brethren hold much Christian truth, but not all of it. We may compare their religion to a stained glass window in which some of the original panes were lost and have been replaced by opaque glass: Something that was present at the beginning is now gone, and something that does not fit has been inserted to fill up the empty space. The unity of the original window has been marred.
When, centuries ago, they split away from the Catholic Church, the theological ancestors of these Christians eliminated some authentic beliefs and added new ones of their own making. The forms of Christianity they established are really incomplete Christianity.
Only The Catholic Church was founded by Jesus, and only it has been able to preserve all Christian truth without any error–and great numbers of people are coming to see this.