What denominations teach about other denomination's beliefs?

For 47 years I have been regularly attending services of worship in Baptist and Presbyterian gatherings. Not once, where the service was on a Sunday, with preaching from the Bible a main feature, did anyone teach any of the doctrines from a differing denomination.

Of course, my memory cannot be taken as a sound authority, and it may also be possible that on rare occasions where I did not attend, that was done. This answer can only be based on personal experience. However, 47 years' experience might be worth something, for the purpose of this question.

What I have heard on occasions are brief warning statements from the pulpit that certain denominations do not adhere to a particular doctrine being preached on that day. There could be some slight mention of their reasons for that, but that could never be called "teaching" about the other denomination's beliefs.

Sometimes, in many church buildings, there may be a library where books explaining what other denominations teach can be read by interested persons, but they invariably go on to detail why such different beliefs are to be guarded against (from an orthodoxly Christian stance). Such books have never formed a basis for preaching, or teaching within the restrictions of this question, in my experience.

What denominations teach about other denomination's beliefs?

When you ask "about official statements, teachings, or classes from one denomination about other denominations during normal church services," priests in Catholicism generally preach about the Gospel text or personal sanctification or the mysteries of a particular feast at church services rather than what the church teaches about other denominations. Such topics are generally for classes in a seminary or classes outside of church services, if the faithful are even interested. Official statements come from Rome and occasional experts.

As for preaching, Catholic ministers (and I believe this to be the same across the bourd with other denominations) generally do not preach about what other denominations teach, except as a side not in a homily. Catholic priests and deacon generally preach about the biblical text of that day, and the sanctification of the individual in given circumstances. The topic of a homily might simply be about explaining the sacred mysteries of a particular feast, for example the Holy Trinity on Trinity Sunday.

Rarely will a priest mention what other denominations believe in. It does happen, but rarely. Normally, this happens when the preacher sees a need to clarify something about Catholicism and the beliefs of an other(s) denominations.

Sometimes a priest may preach on subject matter and what makes something theologically valid or not and may even mention, for example, why the Catholic Church declares baptisms invalid within certain denominations. This too is extremely rare and in my parish church, it may happen about three times a year and is even then is only mentioned in passing. Priest tend to preach on what the Catholic Church believes to be the truth, just like any other denominations would.

Again what is important in preaching is the sanctification of your flock and not finger pointing of the errors perceived in other christian churches.

The Content of Sermons

The Pew Research Center used a computer to further analyze sermons for content. The results revealed several similarities and differences between the four denominations. For instance, all four traditions placed a strong emphasis on Jesus, with a 99% usage rate across all sermons. Other commonly used terms by all faiths included “know,” “come,” “people,” “like” and “life.”

Additionally, leaders of all four traditions routinely relied on scripture to lead sermons. More than half of all sermons (56%) referenced text from both the New and Old Testament. As many as 95% of sermons referenced at least one book by name, whether it was the Bible or Gospel or Epistle. Evangelical churches, however, referenced text in at least 97% of sermons.

The similarities, however, diverged there. The focus of the different traditions’ sermons varied greatly, with black Protestants focused more on revival and Evangelicals more on sin. The focus influenced the word choices of religious leaders.

According to the study, leaders of black Protestant churches were eight times more likely to lace their sermons with the term “hallelujah” than those of other denominations. On the other hand, Evangelical leaders were more likely to use terminology related to punishment, sin and redemption. For example, congregations of Evangelical churches were three times more likely to hear the words “eternal hell” and variants of the phrase (such as “eternity in hell”) than members of other traditions.

However, the report did note that if a person were to attend every sermon held by an Evangelical church in the dataset at any given time, he or she would have only a one in 10 chance of hearing a term related to eternal damnation. On the flip side, that same individual would have a 99% chance of hearing the word “love.”

Sermons Across the Denominations: How Do They Compare?

This is an impossible question to answer succinctly, but I think I can point you in the right place. Go and look for sermons on Luke 9:49–50

“Master,” said John, “we saw someone driving out demons in your name and we tried to stop him, because he is not one of us.”

“Do not stop him,” Jesus said, “for whoever is not against you is for you.”

(Lectionary: 455 in the Roman Lectionary, possibly sometime soon after the Transfiguration is preached on in other denominations)

My hope, at least, is that this is how denominations would approach preaching about other denominations.