Catholics do say the Lord's Prayer as it is found in Scripture; and even as it is found in YOUR version of Scripture.

We do not condemn the Doxology, "for thine is the kingdom and the power and the glory forever." It is a beautiful prayer. However, it is not Scriptural.

The Doxology is found in the King James Version, it is true. The King James Revised Version, however, omits it and makes a marginal note that some manuscripts have this but that the better ones did not. So, too, the Revised Standard Version says in the footnote under Matt. 6:13:13:

"Other authorities, some ancient, add in some form 'for thine is the kingdom and the power and the glory, forever, Amen'." Therefore, we might say that NON-CATHOLICS are not using the text of the Lord's Prayer found in the latest versions of their own Bible.