On the other hand, Mennonites have maintained that commitment to pacificism throughout history even when it has meant the loss of the kind of freedom you are describing. For them, it is considered blasphemy against God to give credit to human beings for what they believe the Bible says God has already done: give them freedom.
As I understand it, the singing of the national anthem is not a “compromise of their religious beliefs”, it is a change of stance about how those beliefs are applied. The national anthem and flag have never been a set religious dogma for Mennonites and for years Mennonites have had a wide variety of responses to both.
War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse...A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
-John Stuart Mill