And thus the question, how do you know what you believe, Petronski, if you do not read the original source, but rely on something else?
If I read ten or five or three or even one reliable resource that says the Book of Mormon rejects the Trinity, I know that the book is false.
I can know Dianetics is false simply by reading the secret Xenu papers online or even by seeing them described on South Park.
Your question is synonymous to “How can you know an event occurred if you were not an eyewitness?”