Hi. I'm a new member, not a Witness, but an armchair religious student. After studying religion for 35 years, trying to disprove Witness doctrine, I admit defeat.
It is easy for me to prove the accuracy of JWs major beliefs by using only Protestant and Catholic writings ( especially Catholic). To start, I will point out that the title of this topic is wrong. The NWT rendering of John 20:28 is correct. It is easy for me to prove the accuracy of the NWT by using modern Cath and Prot bibles, especially the Cath " New Jerusalem Bible" (1965). This bible is so close to the NWT that you won't believe it. And it's the current official bible, if I'm not mistaken. It has put the name Yahweh back in all it's 7000 places!
In the official Catholic "Dictionary of the Bible" 1965, it says (about J. 20:28) - "Thomas invokes Jesus with the titles which belong to the Father, 'My Lord and my God'. This quote is self-explanatory. I have numerous other non-JW proofs that support their stance on this verse for those interested.
As an aside, this same Catholic work says on the same page (about John 1:1) - it "should rigorously be translated 'the word was with the God [= the Father], and the word was a divine being.'" Sounds like what JWs have been saying, isn't it?
As another aside, I came across an anti-Witness site which had a lengthy blog about the Watchtower society not allowing its members to surf the net. Then I picked up a WT mag and guess what. It had their web address on it. Yes, I will also reveal the numerous lies told about JWs by those who do not have facts, to any interested parties. Thanks, Wayne