I can certainly see the irony, Daniel.
As it happens, I know my MP very well and know he is a man whose conscience has a Christian formation, but that is not why I am voting for him (although it is why I act as his agent at election time). I can't see that any of the main parties are in any sense 'more Christian'. I feel strongly on the abortion issue, but there is no 'anti-abortion' or even 'restricting abortion' party, and even if there was one, would I vote for it if its positions on other things I care about were not in accord with my faith?
I don't think that association with political parties has done any Church or religious group any good, but I suspect it has done some Churches a deal of harm.
Even when one votes for a party, one knows one is voting for some things which one dislikes, and no party, not even the one for whom I have worked at the last seven General Elections actually fully represents my views, so I go for the one which comes closest. A choice of lesser evils is not, after all, unusual in this world.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)