I understand it cannot be migrated to BHSE as it is, but I believe the question should be closed with the suggestion it be reworded specifically for BHSE or Christianity SE. However, in it's current form it is really not perfect for either site but is closer to falling within BHSE standards.
Let's review the tours for the two SE sites and what Westar and the seminar and the topic question all say:
Ask about...
- the history of denominations (such as Roman Catholic, Anglican, Church of Christ, or the Church of Jesus Christ of Latter-day Saints) and movements (such as Pentecostalism, Creationism, Calvinism)
- understanding the Bible from the perspective of a specific viewpoint (like those listed above)
- explanations of the beliefs and practices of a denomination or movement
- the Biblical basis for a belief or practice
From the Westar website:
https://www.westarinstitute.org/about/
Westar is not affiliated with any religious institution or denomination and does not advocate a particular theological point of view.
Don't ask about...
- a survey of all Christian views on a particular subject
- what the Bible says about a subject (unless you specify a doctrine/tradition)
- advice on how to handle certain situations (pastoral advice questions)
- is "X" a sin questions that ask whether a certain action or belief is sinful
- "Truth" questions that do not focus on what a specific group of people teaches
- whether some group or person is "Christian"
From the summary of the Seminar on the Acts of the Apostles:
The Seminar on the Acts of the Apostles began deliberations in 2001, with the task of going through the canonical Acts of the Apostles from beginning to end and evaluating it for historical accuracy.
If your question is about...
- interpretation of a specific Bible passage
- hermeneutical approaches
- translation of Biblical texts
- historical context (with regards to a particular text)
- source criticism
... then this is the right place to ask.
The question at hand says:
The Seminar on Acts of the Apostles sat for ten years until 2011, examining the Acts of the Apostles. What were its main findings and how were they arrived at?
An answer that has a description of how they were arrived at would be a purely hermeneutical exercise (unless they did come out of a specific Tradition).
What their findings are is a very agnostic question. It fails to connect to Christianity in any specific way. At best it is too broad. Their findings may involve or impact Christian history or doctrine but the result is broad and/or vague.
Suggestion for editing for C.SE
I would suggest a series of questions that specifically target a review of the Seminar and it's influence, disagreement or similarity, or doctrinal impact if true on a specific scope/denomination/tradition. Or questions clarifying its conclusions within Christian history.
If Christianity did not begin primarily in Jerusalem, where did it? (According to the Seminar on Acts)
Or
If true, how would adherents of biblical inerrancy reconcile character names in Acts being fictional?
Conclusion
Specifically in this case:
Being neither a focused question about Christianity nor a question solely about the Seminar's approach and evidence, the question should be modified to be tailored for one specific site, or two, with one version for each, even.
In general as policy:
Questions simply asking for a review of the content of a book should not be allowed on Christianity SE. Questions on books or any published material (research papers, journal articles, recordings, videos, etc) should have to engage with a particular part of Christianity: it's doctrine, denominations or history. Asking for a book reviews is not a good question.
Does it have to be "Christian"?
I'll add that a benefit of this approach will be that we as a community do not need to sit in judgment on the source. Whether or not the source that is engaged with a part of Christianity is Christian itself is irrelevant. In fact, just as the site guidelines say, it's not really our place to ask if a group or person is Christian.
If we both require sources to be Christian and allow questions summarizing sources then part of such questions will be to decide if they are Christian, necessarily violating our own guidelines.
Instead, we should be ensuring that all questions are about Christianity in some way. Even secular sources can now engage or be engaged by a point of Christianity.
Appendix
Some of my Reasoning
One may also think of it this way, a Formula:
Consider how we have concluded that "What does the Bible say about X?" questions are off-topic. Same with "What did Martin Luther (Y) believe?
The proper way to ask such questions is "What does the Bible have to say about X according to Y?" And "What did Martin Luther (Y) believe about X?"
X is the part of Christianity that is being discussed. Y is the part that is engaging with or being engaged by X in some way. But a question needs both factors X and Y to be complete, focused and on-topic. A question with only one factor tends to either be too broad (Y with no X) or primarily opinion based (X with no Y)
A question asking for a review or summary of a source (book, recording, video, article, any published material) is just like asking about the Y but not telling us where or what X is. It is just asking:
"What does Y say?" This never an acceptable question in any other case, why would it be now?
Some books will certainly engage with Christianity by their nature and topic, but in what and in how many ways? At best, it is still too broad. I highly doubt that C.SE wants to open the "Pandora's Box" that would be allowing book reviews simply summarizing a source's content.
Compare:
- "What does Augustine's City of God say?" vs "What does Augustine's City of God say about original sin?"
- "What does Dawkins' The God Delusion say?" vs "How have Reformed theologians responded to what Dawkins' The God Delusion says regarding Original Sin?"
The latter still allows even secular sources to engage with Christianity though you may notice it is reversed to be how Christianity has engaged with Dawkins.
Examples
Examples of relevant precedents from these two sites:
Questions on Christianity SE that involve books but connect to Christianity specifically:
How does mainstream Christianity view "Heaven is for Real"?
Notice it is not "What is the book "Heaven is for Real" about?" That would be invalid.
Have any major Christian intellectuals responded to Stephen Hawking's "The Grand Design"?
This is not asking for a summary of The Grand Design but it is looking for a response from Christianity.
On BHSE
Involving multiple biblical books and a particular model at BHSE:
https://hermeneutics.stackexchange.com/questions/4401/what-is-the-relationship-between-the-synoptics-and-the-gospel-of-thomas
Not out of one text but only directed to particular texts identified as Q by particular criticism model:
https://hermeneutics.stackexchange.com/questions/4402/what-signs-does-q-show-of-stages-of-composition