You would compare what they say with what relevant passages from The Bible say to see how wide (how many books, how many authors) support them and what other passages oppose them. In doing so, you have to ask how the people to who the passages were written would have understood them, and also interpret them according to their literary type (history as history, poetry as poetry, etc).
If the doctrine don't line up with the whole Bible and not a fraction then it is biblical.
Another answer:
If by "new doctrines" you mean "different" from Bible doctrine, then no, it cannot be biblical.
Galatians 1:8, 9 - But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed. [NKJV]
http://www.jesus-is-savior.com/Believer%27s%20Corner/Doctrines/repentance.htm
Douglas Taylor has written: 'Landmarks in regeneration' -- subject(s): Bible, Biblical teaching, Commentaries, Doctrines, New Jerusalem Church, Regeneration (Theology), Seven churches
Eduard Preuss has written: 'The justification of the sinner before God' -- subject(s): Doctrines, Justification (Christian theology), History of doctrines, Lutheran Church, Biblical teaching
Donald Ernest Mansell has written: 'Angels and the unseen conflict' -- subject(s): Angels, Doctrines, Seventh-Day Adventists, Biblical teaching, Christianity 'Adventists and Armageddon' -- subject(s): Armageddon, Bible, Biblical teaching, Doctrines, Prophecies, Seventh-Day Adventists 'Open Secrets of the Antichrist'
I think that you are referring to what is known as the Fundamentalists.
Ralf Miggelbrink has written: 'Der zornige Gott' -- subject(s): Biblical teaching, God, History of doctrines, Wrath
Deborah B. Haarsma has written: 'Origins' -- subject(s): Beginning, Biblical cosmology, Christian Reformed Church, Christianity, Cosmogony, Creation, Doctrines, Evolution (Biology), Religious aspects, Religious aspects of Evolution (Biology) 'Origins' -- subject(s): Doctrines, Cosmogony, Christian Reformed Church, Biblical cosmology, Evolution (Biology), Creation, Beginning, Christianity
Richard K. Moore has written: 'Rectification (\\' -- subject(s): Bible, Biblical teaching, History of doctrines, Justification, Theology
David Michael Stanley has written: 'Christ's resurrection in Pauline soteriology' -- subject(s): Bible, Biblical teaching, Resurrection, Salvation, Theology 'The apostolic church in the New Testament' -- subject(s): History of doctrines, Church
John Wallas has written: 'Plain scriptural thoughts on holy baptism' -- subject(s): Doctrines, Baptism, Church of England, Biblical teaching
Eric Shuster has written: 'The biblical roots of Mormonism' -- subject(s): Doctrines, Mormon Church, Bible, Church of Jesus Christ of Latter-day Saints, Theology 'Catholic roots, Mormon harvest' -- subject(s): Doctrines, Biography, Conversion, Mormon converts, Ex-church members, Church of Jesus Christ of Latter-day Saints, Catholic Church 'The biblical roots of Mormonism' -- subject(s): Doctrines, Mormon Church, Bible, Church of Jesus Christ of Latter-day Saints, Theology
The address of the Museum Of Biblical Art is: 1865 Broadway, New York, NY 10023-7505