OP- Are you aware of other religions that have similar beliefs as Jehovah Witnesses regarding war, holidays, not being part of this world, etc? All you need to do is a bit of research.
CHRISTADELPHIANS- Christadelphians take no part in politics, voting, or military service.
ASSEMBLY OF YHWHHOSHUA-
A member in no way should participate into the affairs and practices of the world. …Thus a servant of YHWH can not vote or contribute to or accept any benefits from the institutes of the United States …nor should he be allowed to be a government official, to be a juror, or to serve in the Armed Forces. …Christmas …and any other heathen holiday are not celebrated in this assembly because of the inherent revelry contained in such celebration, as in the pagan names and sources that they represent.
ASSEMBLIES OF YAHWEH
Affiliated assemblies are located in 50 countries around the world. The missionary thrust, both foreign and domestic, is concentrated through the Sacred name Broadcast, heard over 24 stations across the United States (as of 1995) and in 75 foreign countries. …Affiliated members are found in 115 countries.