There are some worshipers of evil. If we meet someone like those people, how should we treat them? Should we treat them like we treat followers of other religions like for example Christians, Hindus etc.) or some other way? Can we be their friends?
We are related to all the people in the word. We have been given divine guidance which we need to communicate to the world. This is only possible if we interact with them and invite them to the true guidance. We are not required to enter into enmity to all the non-Muslims. This would make any propagation impossible. I would suggest everyone should behave normally with them. If we have good knowledge of our religion we can invite them to the truth. A layman can by his good behavior attract them to the religion of truth by his excellent behavior. We are not supposed to wage war on those who follow different religions.