Religion is divisive too but you can't withdraw from that? We might think we have pure religion but often we need Iron to sharpen iron. Politics is defined most aptly by Harold Lasswell, "who gets what, when and how." based on a book by the same title. There are family politics, work politics and governmental politics. With about 1/3rd of your money (some more and some less) to not be involved seems like poor stewardship to me. Important issues like health care for the poor and other Godly issues are all now intertwined within the framework of the government. So i encourage you to rethink your never voting again, and at a minimum support those who you think are doing a decent job. That just as we are commanded to pray for government our actions like voting are sometimes important too. Think too about the role of religion in politics.
Martin Luther for instance gave thoughts on what he believed the right profit margin was for the emerging merchant class
The bible has prescriptions for the Jews not to involved themselves in usury.
The American revolution was in part born out of a Christian context.
Prohibition, slavery, the war on poverty all have Christian underpinnings even with some Christians on opposing sides. I suggest everyone should allow all of God in their lives and it may included politics and public policy, or it may not. God spoke politics too. He sent the angels to warn Mary and Joseph to move to another country because the young males were going to be slaughtered. Paul in Acts was so political. Not only being imprisoned by political leaders but he preached and did so many things with the Jewish and political leaders of his time. That preaching was quite the testimony.
I can understand your frustration. I knew the Poly Sci chair of one of the largest universities in the USA say that they older he got the more cycilca he has become about politics. But still, you have to have some hope otherwise we could not even pray that it will be well. God hears the cries of people and yes he does still raise and put down leaders. He too knows that government is a necessary institution. Anyway, to de-emphasize is fine, to disengage seems like a stretch. remember too that God has called some to politics. Without that would the USA have installed God given rights in the Constitution? Sure there are many wolves in this area, but all the more reason to support those that you believe might be faithful in God.
Anyway, God bless you richly and thanks for sharing in this forum