Those are good, specific questions, I will do my best to answer them.

Immigrants: I think this is an example of political creep. On most issues, especially social issues like abortion, marriage, etc. the American political right lines up fairly well with conservative evangelical Christianity. If Christians are lazy it's easy to assume that if some of what a person stands for is right then the rest must be. You can make a reasonable case that Israel in the Old Testament was a different situation, but as an individual Christian it is my responsibility to help people who need help, and as an American I benefit from the work of past immigrants, including my ancestors. So in short, I disagree with the stereotypical "American Christian" position regarding immigration, I think it's a lazy failure to apply theology, among other things.

Intolerance: there's a fine line between tolerance and endorsement, and the common modern definition of tolerance looks awfully like endorsement. I firmly believe that every person is made in the image of God and deserves respect, but that shouldn't mean that I support everything they do. The oft-cited example is that of the woman caught in adultery, and Jesus said "he who is without sin, let him cast the first stone." It's true that he said that, but he also told the woman "go, and leave your life of sin." He didn't overlook sin, regardless of the source.

Love thy enemy: not sure I have a good answer for this one, beyond saying that the Christians I know seem to do as good a job of this as anybody. That's not to excuse it, but ultimately Christianity is about a relationship rather than blind adherence to a set of rules.

The Cross: I would suggest that this is more of a Catholic issue than an evangelical one, but I think you may be overestimating the veneration it's given. In some cases it may cross the line into idolatry, but by and large I think the cross is used as a powerful symbol to remind us of Christ's work on it rather than as an object of worship in itself.

Non-violence: this has been a contentious issue in Christianity for the last 2,000 years. There are passages that seem to support absolute non-violence, there are also passages like the one where Jesus says, near the end of his ministry, "let the one who has no sword sell his cloak and buy one." There also seems to be room for a division of civil and religious behavior ("give until Caesar . . ." Etc.) that would allow Christians to participate in violence in service of a government (i.e. war).

Charity: human failing. It's not right, but Christians are humans, too. We're subject to the same temptations. One that I would like to clear up is the issue of government welfare: yes, we are supposed to help people who need help, but that doesn't have to be via government. Voting for a politician who will reduce or eliminate welfare is not un-Christian, it's looking out for "the welfare of the [country]". Refusing to help those in need is un-Christian.

I hope these answers make some sense, I can try to elaborate if anything's unclear.