1) Why does only the Catholic Church have saints and not the Christian spin-off religions?
This is not an accurate claim. The obvious exceptions: Eastern Orthodox Church, Oriental Orthodox Church, Assyrian Church of the East. The less obvious but more glaring exceptions: the Anglican Communion, Lutheranism (both of which have saints and both of which are very large Protestant sects).
2) Why haven't Baptists and Protestants and the other churches started in the past couple of hundred years jumped on the sainthood bandwagon?
One of their fundamental teachings is that the word "saint" refers to any devout Christian and not specifically to dead or miracle-causing or especially holy Christians.
- Jim, http://www.bible-reviews.com/