There are too many to list. I don't have a problem with the identity of God, though. The Godhead is one and He has revealed Himself in three distinct ways throughout the ages; hence His triune nature. However, from reading your posts, it seems that you are not including the Holy Spirit who is at work on earth in this present age.<quoted text>Can you, please and if you will, list these mysteries? Other than these, what mysteries do you speak of?
And many Protestants are beginning to shun the term "trinity,". Nevertheless, "trinitarianism" is only one of many doctrines that Protestantism regards sacred, that Catholicism has invented. Protestants wish to reject the term, but still adhere to the doctrine itself. History repeats itself. At one time, a "fag" was never a homosexual, nor was one that was "gay." But, time will take its toll. Lies will be invented, and those that fear will adhere. After a matter of time, the same lies will be revered as truth, and rejected. History repeats itself.
People, many times, mention the plurality of the term "God," when "us" is mentioned in verse. But, for some reason, we reject the mere notion that "us" means "two," even though "two" is still plural. Obviously, we take the mention of three in verse to exceed the definition, just as if I mentioned myself, my wife, and my child. When the term "one" is used, this is derived from the terms "HEIS" and "MIA." "HEIS" is always used figuratively, but "MIA," literally. But, when we read certain verses, like John 10:30 and 1John 5:7-8, the same that utilizes the term "HEIS," we tend to apply a literal application to the definition and meaning of the term. We're afraid of displeasing "God." We're afraid, even though we're not given the spirit of fear, but of boldness. We're afraid, even though our anointed Savior has proven, many times, that the most High will overlook certain acts of rebellion when they're necessary, like picking corn on the sabbath. I'm not trying to lead you away from our Godhead, but closer to them. There are no mysteries regarding our Father, our anointed Savior, nor our Godhead. They want us to know them personally, from intricate detail to intricate detail. If you don't believe me, just listen to me for a little while. Surely, you don't believe that the wisest being of all time and creation, that wants nothing less than for us to know Him and His only-begotten Son, left Himself, and His Son, mysterious, do you?
The Father walked and talked with Adam in the Garden of Eden. He chose Abraham to be the father of many nations. He chose Moses to lead His children out of bondage, etc. He established a theocracy in the nation of Israel. But, even through His multiple interventions with the Hebrews, they rejected Him and desired to govern themselves in their own fashion. It started with the judges and continued on with the kings, and only a very few kings were willing to please Him.
He spoke to the prophets who wrote down their accounts which have been preserved for us to learn from today. But overall, He was rejected by the multitudes; with only a remnant truly receiving what He had to offer. So He brought judgement on the divided kingdom, first to Israel and then to Judah. But this of course did not alter His plan. So He sent His Son Jesus to provide a way back to Himself. And as well we know that He was rejected and given over to the Roman authorities and crucified. But again His plan was not thwarted. Jesus even said that after He left, He would send another Comforter, and after Pentecost, He (the Holy Spirit) was rejected and is still being rejected today.
Me, I have no problem with the three distinct personalities that the Godhead (God) has manifested Himself as. According to Philippians, Jesus emptied Himself (kenosis) of many privileges to become a man, yet He remained God. And the Holy Spirit is our guide in this present age. More later as time and space are running out.