the Gospel and politics

I would agree mostly with you except for the claim that Jesus wanted nothing to do with politics. If we look at the entire Scripture we see in St Paul's letters (I presently don't remember the references) which are of course inspired by the Holy Spirit there is the line about "honoring the king" and the "sword having been giving to the governing authorities", etc. However, I think you are certainly right concerning the main purpose of Christianity is to get our hearts right before God---but there is the sense that in historic Christianity there has quite often been an intrusion into politics: William Wilburforce arguing in England against the slave trade, Reverend Stowe preaching against slavery, John Paul II and his part in the taking down of the Berlin Wall, to name just a few. But you are so right to keep politics as secondary to the salvivic primary goal.