Hello, I am a new user and I am not claiming to be as well-versed as my fellow brothers here on this site. I am a relatively new believer, I was saved about 16 months ago, and since then I have learned a great deal about theology on the side as I pursue entrance into a medical school while I finish up work as a Post-Bacc student. After becoming saved, I struggled with the doctrine of the Trinity, how the one God exists as three distinct persons that all share the same, one divine essence (clear that up for me if I am mistaken). I have encountered those who reject the Trinity yet still show (apparent) signs of regeneracy such as faithful preaching of the true Gospel, emphasis on the 5 solas, among other things. When I say reject the Trinity I mean that when confronted with the claim, "The Father did not die on the cross for our sins, it was only and solely the Son, who was sent by the Father." they get hostile. To be clear, they believe Jesus is God, that there are distinctions within the "persons" (which are really just modes) of God, and the three exist simultaneously, but it's just one person doing it all so when Jesus is called "Almighty Father" in Isaiah 9:6 they are saying "Jesus=Father" (which is wrong). Does this lack of holding to the doctrine of the Trinity laid out in the creeds put them outside of salvation (as the creeds say), or does it just show lack of maturity? Sorry for the long post, I am looking for those smarter than I to lend a hand. Thanks.