The message of Jesus Christ is permanent and universal - but 'the State' is an entity very labile and variously defined, and also non-universal.
The earliest known human societies had no 'state' nor anything analogous - and several such 'hunter gatherer' societies these survived into the early twentieth century. It would be an etiolated belief in Jesus that tied-itself to the survival of any specific form of political organisation, such as The State.
Yet, the fact that Christianity arose in the context of the Roman Empire, and existed for most of its history in 'medieval'-type agrarian societies - in which the ruling class was divided into priesthood and warriors - has distorted and confused the matter of 'Christianity and politics' by defining it in terms of 'Church and State'.
So, to make sense of Christianity and politics requires taking a step back from Church and State - in recognising that Christianity is not The Church and Politics is not The State.
Once that conceptualisation has been achieved, then there is no longer anything difficult in understanding the proper relation between Christianity and politics; because it is clear which is the most important, which should to frame the other, and to what end society ought to be orientated.