Slim,
Of course there's a connection between Judaism and Christianity. Jesus was a Jew. But very rapidly these religions grew apart. Therefore we have to adhere to the oldest writings of each religion and their evolution if we want obtain the original intent of the author. You can speculate all day long, but at the end of the day you have to stick to the evidence. The NT does not contain God's name, whatever the reason. Perhaps it was so sacred that it shouldn't even be said or written. So a true Christian, according to the evidence from the oldest NT books, should not be flaunting God's name as JW's do. Some of the most recent and respected translators of the Bible do not use "Jehovah" in the OT because they know was not intended by the original writers. And obviously, in the NT the translators don't use any name of God at all because they are forced to stick to the evidence. Evidence should matter.