Disgree on Doctrines and still be saved?

Christian can disagree on doctrines as long as they don't agree on the doctrine of SALVATION and other important doctrines (i.e. Apostle Creed). Are you TRULY SAVED? God looks in our hearts, not our works. Anyone can know this by looking in their hearts and see where they are at in their relationship with God. Is my heart bearing fruits from the Holy Spirit rather than works? ONLY God knows. I truly believe that you are saved but only God knows for sure. Christ through His death and resurrection, every legal hindrance has been met and satisfied. There is nothing that can keep US from assurance. Its not about thinking our way into salvation or to reason our way into salvation via works. The only way to get in is to believe (gift of faith from the Holy Spirit) Him with my heart which is sealed by the Holy Spirit.