Theology is the study of the word of God, and there is no other God other than the God of the Bible (Isaiah 43:11 for one).
2Pe 1:21 "for not at any time has prophecy been produced by the will of man, but being produced by the Holy Spirit men had spoken from Yahweh."
There is not going to be any more prophets, Christ was the last, and the Apostles are ambassadors for His message (Heb 1:1). So a man cannot make up a new Gospel and preach that message.
Gal 1:8 But even if we, or a messenger from heaven, should announce a good message to you contrary to that which we have announced to you, he must be accursed.
Gal 1:9 Just as we have said before, now also I say again, if anyone brings you a good message contrary to that which you have received, he must be accursed.
Yet if a man like Hitler speaks according to the Bible and seeks to defend Christendom, I can certainly agree with that man.
Isa 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them
But if the pope (or any churchman) says that negroes can be Christian, am I suppose to accept that man and forsake Christ?, Is the pope my saviour now, is the pope my God? ...indeed, the pope is preaching another Gospel, another Jesus and another message and not the one taught by Christ.
2Co 11:4 For if indeed one coming proclaims another Yahshua whom we did not proclaim, or you admit a different spirit which you have not received, or a different good message which you had not accepted, would you hold up well?
Gal 1:9 Just as we have said before, now also I say again, if anyone brings you a good message contrary to that which you have received, he must be accursed.
And I think that is idolatry. We are not suppose to lean to our own understanding either, (Pro 3:5) or learn 'beyond' the things which have been written. (1Co 4:6). We should not be mislead by the traditions, sayings or myths of men.
Mar 7:13 rendering void the Word of Yahweh by your tradition which you have transmitted, and many such similar things which you do!"
2Pe 1:16 For not following after cleverly devised myths have we made known to you the power and presence of our Prince Yahshua Christ, but having been spectators of His majesty.
Col 2:8 Watch that there be no one captivating you through philosophy and vain deceit, in accordance with the tradition of men, in accordance with the elements of the Society, and not in accordance with Christ.
Joh 12:48 He rejecting Me and not receiving My words has one judging him: the Word which I have spoken, that shall judge him on the last day.