If you study islam for 50 years, you would still be wrong....If you study Catholicism for about 2 years, you will know Christ's truths and learn to accept what Christians have accepted for 2,015 years so far.
All of Christs truth relevant to salvation is in scripture I know you believe your system has a monopoly on truth, it does not even Paul said we all see as through a mirror darkly And many Christians through the years have rejected what they see as erroneous in your denomination it is not the monopoly you would like to believe As I said before the only common ground you and I have is to agree to disagree