Ephesians 6:12 makes it clear that "we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places". We are not fighting people, whether communists, socialists, liberalists, feminists, homosexualists, terrorists, Islamists, Jews or any other human when fighting evil. We are fighting demons, real persons without a body. We are fighting satan. However, satan indeed uses those who he owns to wage war against true Christians.
The Bible throughout the Old Testament and New Testament has represented government as unrighteous and wicked - from the wicked kings of Israel, warring enemies of Israel to the Roman Empire which actively persecuted God's people. The role of government as a human organisation in any nation, era or culture is to deal with human affairs. The word 'politics' means 'human affairs'. Such a role is inherently an earthly one.
To be earthly-minded is to focus on earthly things that will rot. It is hold earthly things as one's treasure. Whoever holds earthly things as one's treasure will serve his desire to gain more earthly comfort for "where your treasure is, there will your heart be also" (Matthew 6:21). Mammon is the spirit behind all earthly things, not just money as many Christians seem to think. The love of money is the root of all evil (1 Timothy 6:10).