Hi Little Mary,
You have already gotten many good answers. But I would like to add from a Protestant perspective. To be fair many Evangelicals have lousy seminaries. But many classical protestants like Presbyterians and Lutherans have excellent seminaries and, if I may be so bold, generally speaking the Ministers they produce have a far better knowledge of scripture and Biblical languages than many Catholic Priests. That is not an attack it is just pointing out the different focuses. Priests are concerned with the Mass as a whole and are trained accordingly. Protestants are more concerned with the study of scripture and are trained accordingly. When one studies Church history and the Fathers there is such a variety of thought on many issues that it is not so cut and dry. Certainly the early church looked more catholic in many respects. But there are many fathers that looked more protesatnt in some respects. While St. Augustine was very catholic in certain areas. Lutherans and Presbyterians (Calvinists) would be more in agreement with him that most modern catholics regarding predestination and free will. So there is much to consider. But I generally agree that an honest overall look at church history does lend more over all evidence for Catholic claims than it does for run-of-the-mill Evangelical claims.
As for your actual question
: Protestants Pastors, like Catholic priests for the most part become Pastors because they believe their confession to be accurate and are concerned for souls and want to feed the sheep. We all have our preconceptions and if someone grew up a devout protestant or had a bad overall experience with the Catholic Church (like I did) then it seems reasonable that they would want to serve God and the church as best they understand how. And many do a wonderful job.
Blessings,
Mel