You can believe in Jesus, and be completely ignorant of the debates regarding fallen man's hostile-to-God, light-hating condition, election, predestination, faith as a gift from God vs freewillism, etc.; however, once you find out about these things, from the Bible, as a born again Christian, you should believe them; but, opposing them habitually, is a very bad sign.
The Doctrines of Grace, essentially, say that salvation is of the Lord and his grace, and is not contingent upon anything from sinful man. How can anyone who has been born of God keep arguing against this, for years, or decades, on end? Where is the Holy Spirit conviction? Where is the belief of what God has told us about the cross (effectual redemption, propitiation, etc.). Where is the faith in what Jesus came to do (save his people from their sins - not make it possible for everyone to be saved)? Where is the self-awareness?