Why do liberals and atheists consider Christianity as the ONLY "religion?"

Maybe you’ve noticed that when someone wants to take the name of the Lord in vain and use it as a swear word, it’s never “Buddha!!!” or “Mohammed!!!” or “Vishnu!!!” It’s always “God!!” or “Jesus!!” Maybe you’ve also noticed “separation of church and state” isn’t applied to any religion except Christianity. In the minds of people who think that “separation of church and state” is actually in the constitution (it’s not) the religion is Christianity. No other religion is even real. During this C...