Can we end a discussion of what is required to be a Christian? We have been asked what would happen if there were no Jehovah's Witnesses.
If we count them since 1870, then world we live today would be unrecognizable. Seven millions people would live vastly different lives - some of them would die in a wars they never OTL fought, some of them would not face OTL persecution and live. In fact, every man who OTL met a JW would have vastly different life. What if some annoying publisher delayed his departure to work? In that world he could lose his job/have traffic accident/something else. Every event can influence other things - for example, living man who OTL could die due to his religion will have a child. This child can be a military genius that leads to quicker victories in the World War II or a complete moron who lose Normandy landings. He can be the politician, revolutionary, presidential assasin, political activist who changes direction of OTL elections.
Besides, Dwight D. Eisenhower life would be vastly different. Maybe Robert Taft wins 1952 election. Thus, we can see limited interventionism in the US, withdrawal from Indochina, Europe becoming socialist/even communist.