if you are truly born again, believing in false doctrine will not prevent you on going to heaven as long as you have the proper foundation under you.
But can you be born again if you believe in a false doctrine?
Isn't a false doctrine just as bad as no doctrine at all?
An atheist isn't born again because he doesn't believe in Father/Son/HS
But does someone that follows a false doctrine believe in the true Father/Son/HS?
Believing in a doctrine means believing God does certain things in a certain way. And that shows the personality of God.
But what if your idea of Gods personallity is totally wrong don't you just believe in a false image/god.
Meaning believing in something that doesn't exit. Because there is only one God you believe in that one true God or basicly you are the as any pagan.