Has Newt given testimony that he has accepted Christ as Lord and Personal Savior?
If so, that is news to me. Because if he understood the true meaning of salvation (Eph 2:8-9) why would he join the Roman Catholic Church? Some Roman Catholics who understand the true meaning of salvation sometimes do remain in the Church, but not many of them because many teachings of the RCC and the Bible are in contradiction. Especially the doctrine of salvation.
http://www.ourlittleplace.com/testimony.html
(One woman’s story of conversion from RCC upon learning the real Gospel)
If you understood the true meaning of salvation you would run as fast as you could to the nearest Catholic Church to repent, receive absolution, and receive communion at Mass.
I was led to Christ by the Pastor at the Church where I stumbled into after a great big wake up call for me in 1984 after leaving active duty. His name is Rev Steve Brown and he now has a radio ministry called Key Life after that church, Key Biscayne Presbyterian Church in Miami. FL. Steve Brown taught me a great number of things and one of them is quite close to the question you posed. I guess the most cogent answer (because I asked the same after my own sister did exactly the same thing in joining the Catholic Church after being raised Protestant) is that nobody but God knows the human heart. If a person believes in the redemption of sin based on Christ's sacrifice and resurrection and the life everlasting then they're a Christian and the little human inconsistencies we all raise about each other are but devices designed to break apart Crisendom. I was raised Baptist and so I believe in THE RAPTURE whereas the Presbyterian Church in America (PCA is more fundamentalist as opposed to the way liberal Presbyterian Church USA) that I joined as a result of my accepting Christ as Savior, does not recognize that concept. But my Pastors all kinda tease me and say to be sure to grab them by the hand on the way up. But it's all done with a strong sense of love and brotherhood. So you can nitpick if you like. But as long as the Biblical rule is followed as stated in the Bible about not adding to the Bible as written I have no real issue with main stream Christianity. However, that particular mandate still leaves out the Mormons. That's just the way it is. God said it, I believe it and (for me) that settles it.
SO FED up with the self righteous hypocrits...read the bible...read about King David and Bathsheba..read about adultry being considered a sin if a man merely looks at a woman with lust in his heart...stock up on your rocks and throw em...but BEFORE you do...look inside YOUR own family and read the scriptures and see what it says about ANY divorced woman that has remarried...Newt has admitted before the world what he did that is enough for me. MORE than Clinton did!