The Episcopal Church did not exist before 1785. The Seventh Day Adventists did not exist before 1830. The Jehovah Witnesses did not exist before 1872. The Pentecostal churches and Church of God did not exist before 1906. The Assemblies of God did not exist before 1914.
Every denomination teaches out of the Bible.
Problem of Interdenominationalism Comes from a desire for peace and put a stop to the fighting between religious groups. This is an understandable motive. The trouble is that they do not take a stand. Instead of rejecting traditions of men, they accept all traditions. These people draw near to Me with their mouth, And honor Me with their lips, But their heart is far from Me.