I don't think there is any hope of orthodox Christians learning about Christianity. People who study the history of God in our world are labeled Torah observers. If you know the history of our Sunday worship, you are saying Christians worship the sun!!! You may learn that it was discovered that Christ rose on Sunday, but you must assume that means he actually rose on Sunday, not that it was discovered that day. To learn of ancient Hebrew history it would require learning the language they spoke, and that would make them "torah observers". That leaves any of the findings of the dead sea scrolls out as history,.
I have intimate familiarity with the theologies of those who make such claims...that Christianity is a perversion of the true faith, which they claim to represent.
Christians do not worship the sun. They worship Jesus who rose on the eighth day. Additionally, he met with his disciples on the eighth day (first day of the week) on at least two occasions. If Sabbath-keeping is continued as a requirement, then this would be the perfect time for him to meet with them on Saturday, to prove that it was a continuing requirement. Yet, he did not do this.
The phrase "Torah observers" is a problematic one. If you consider that Torah refers to God's instructions, then all believers should be observing all of God's instructions for THEM. But, it is obvious that the Mosaic Law is done away with, so the Mosaic Law, as a whole, does not apply to them. However, they still want to please their Lord, because of the grace he has given them, and because they have been united with Jesus, whose spiritual healing continues to permeate their lives. Therefore they will want to obey and serve the LORD.
So, if you mean to say that believers want to obey God, because they are being conformed to the image of Jesus, then I'm ok with that. If you are claiming they need to follow the Mosaic Law, then this is called Judaizing.
Now, some elements within the Mosaic Law reflect the image of God in man...of course the believer would be reflecting obedience to those laws progressively over time, because they are being transformed into the image of Christ. Days and diets are not part of those issues, but are ceremonial issues.
I don't subscribe to the conspiracy theories that "Torah Observers" believe, though. I am well acquainted with some of them. Some claim that Simon Magus of Acts 8 started the Roman Catholic Church, and that Simon Magus was confused with Simon Peter. Their views are basically legends. Other views are related to Alexander Hislop's excessive anti-Roman Catholicism. As I have said, I don't believe in Roman Catholic teachings as a whole, and consider them an apostate church, but much of what's taught in those sorts of circles concerning Roman Catholicism involves National Enquirer-level reasoning ability.
I'd rather sit on the toilet reading National Enquirers than studying Judaizer materials. It has the same level of credibility with me.