http://freetruth.50webs.org/B1b.htm
Quote: The church did not adopt the cross until about the 6th century (New Catholic Encyclopedia, vol. 4, p. 475).
The word 'cross' was later substituted for the word 'stake' in the rewriting of the Christian text (Crosses In Tradition, W.W.Seymour N.Y. 1898).
Christian archives record that the general use of the crucifix became ratified at the Sixth Ecumenical Council in 680 (Canon 82). The council decreed that 'the figure of a man fastened to a cross be now adopted'.
This new church logo was later confirmed by Pope Hadrian I (772-795).