Well in the same way that monarchy means one (external) ruler, but doesn't mean peace or tranquility, anarchy means one (internal) ruler but does not really mean chaos. Jesus had no ruler other than God/himself. Did not believe in taxes or the government, did not believe in slavery, nor did he believe in world peace. He said so himself "I have not come to bring peace, but a sword" all true christians could do just fine without a government, living in harmony with he rules plainly laid out for us by Jesus. And in my personal opinion all true christians are anarchists, though not all anarchists are christian.