... Christ clearly says that people are saved through Him, not through a church. ...
Are you "saved"? ... If I see it the right way then the opposite of "to be heretics" (= "to be heterodox") means "to be orthodox".
"ortho" means "straight, upright, correct"
"hetero" means "different, diverse"
"dox" comes from the Latin word "docere" and means "teaching". Words in this context are doctor, doctrine, document ...
If I take the word "doctor" then you will see what's the problem. A normal doctor not teaches medicine to other people. He hopes that he got the right instructions on his own and tries to find what's able to help not to become sick in a concrete situation in the best of all possible ways which he currently knows.
And sometimes also help methods which are not "standard medicine" - but to be honest: Under the not standardized medicine is also a lot of unbelievable dangerous bullshit. "Heal cancer with warm air" for example.
And for sure would it be better for any doctor to know the standards - even when a situation might come when one of this standards may not help in a concrete situation - specially in case of a concrete sick person - and he has to find a better way for this concrete person - with the help of god. For example: What is the point of giving Ibuprofen to someone who is allergic to it? Before someone dies of an allergic shock, it might be better to just endure a mild headache.
By the way. Do you have a biblical source for your "biblical" idea here - directly written in the standardized sum of books which is called "the Bible"? The bible was componed once from the church on reason to avoid confusion. My heterodox – or orthodox? – opinion on this: if the Bible causes too much confusion, perhaps we should abolish it again. After all, we managed without the Bible for over three hundred years.