A common claim of Atheists is that Christians will by necessity view non-Christians as "2nd class citizens". Because of this they conclude that all public displays of Christian symbols and beliefs are not just offensive but have the effect of subverting all non-believers to a lower social standing. That idea historically and Biblically incorrect. Granted, religion by itself will almost always produce that outcome, but the Gospel of Christ is radically unique in this regard.
It is well documented that during the 1st and 2nd century Roman empire (and it could be argued throughout history) it was the TRUE Christ followers who demonstrated the most inclusiveness. The pagan Romans discriminated against people socially and the Jewish were racially prejudice. But the early Christians reached out to care for people regardless of their race or social standing. The question is, why? Answer: because at the very core of the true Christian Gospel is a man (who was God incarnate) suffering and dying for people who did not love him and did not accept his message. Anyone who follows his example today has no excuse for looking down on anyone. Taking it a step further, God's grace ought to humble a Christ follower to the point that they consider others (Christian or not) better than themself.