When I think about what it means to be American I think back to our fore fathers. Yes they were christian but they came here looking for the freedom to worship and live the way they wanted. Not the king or Pope's way.
They built this country on the dream of religious freedom for everyone.
They built this country on the dream of being able to say whatever you want to say.
They built this country on the dream of being able to protect yourself and your family.
To me an American is someone who tries to give all people those same rights to religion, speech and protection, no matter how different they are from you. You don't have to talk to someone who believes different. You don't have to let them in your home but as Americans you should respect their rights. You should not do physical harm to anyone or their property even if they are very different from you. If you are invited or go into someone's home or place of worship show the proper respect. If you can't show respect simply don't go. They have the rights to live their life as they see fit just like you do.
That is truly American
