TLDR: He doesn't forgive anyone who sins, he forgives those who repent. Repent not meaning "feeling sorry" as many seem to explain, but actually meaning "to turn away" which means changing fundamentally as a human being. From a bad person to a good person.

Someone who doesn't change and act good most of the time isn't repentant, so isn't forgiven. So basically, you prove it with your actions and how you live your life, not with just words only. By this measurement, Republican "Christians" aren't repentant and so aren't forgiven.

Not a Christian anymore, but I used to be for a very long time. Sidebar: "You will know a tree by it's fruit" AKA you'll know what kind of person someone is by what they do. Anyone who's even skimmed the bible (especially the new testament) would easily understand that most conservative "christians" aren't Christian at all, but rather like the Pharisees (phony religious types) that Jesus constantly argued with and condemned.

Other note: Sikhs actually live the way Christian claim to. I could easily make a "hard to swallow pill" meme which said: "Sikhs are better Christians than actual Christians are."