I didn't realize that one's actions determined whether one was a christian or not.
Actions alone certainly don't determine whether or not someone is a Christian - I would agree with that. It's more than possible for someone to live their life in accordance with many of Christianity's deepest values, and yet not be a Christian, for example.
But what surprises many non-Christians is how often un-Christian behaviour can be exhibited by people who say they are devout Christians. We are told by Christians that theirs is a way of life - a message of love, peace and forgiveness which informs their daily lives. (And for very many, it is indeed that way). But for a number, there appears to be a belief that simply to identify as Christian is sufficient, and that their daily behaviour can then continue in whatever way they choose. (My grandmother used to refer to this phenomenon as "Sunday saints and Monday sinners").
Swinging back into the topic a little, this is where I see a problem with many GOP politicians - I suspect that a proportion identify themselves as Christians, not because they genuinely believe and live their lives according to Christian values, but because they know that the badge will win them power and allow them to pursue their (often rather un-Christian) agenda.
This is the danger with badges. If the badge doesn't represent a true embracing of values, then it can be used to justify any number of inappropriate things. So if you can be a Christian without truly embracing Christian values and behaviour, then the badge of Christianity becomes hugely less meaningful.
And when it comes to politicians, we really, really need to be careful about assuming that everything they say is Christian and decent and right, just because they wear the badge.