Christ died not for our freedom, but to save sinners from their sins, not for freedom in some abstract capacity.
U.S. soldiers died fighting for their country or the empire; take your pick, depending on the war. Again, freedom is abstract; one’s homeland is concrete, reality.
Equating the two is even worse than Julia Ward Howe’s line ‘As Christ died to make men holy, let us die to make men free’ (not ‘live to make men free’; that was a change from the original), because at least that was just drawing an analogy, rather than outright equating the two.
It trivializes Christ’s atoning work, equating it with human efforts, equates the work of God’s advancement of His Kingdom with the advancement of an earthly, temporal realm, and is therefore sacrilegious.
Remember, the road to hell is paved with good intentions.