Twitter is a conversational platform. Historically, if you’re the host for conversationalists, you get to define what the social boundaries shall be in your “salon.” Considering the public nature and well-established inflammatory capacity of Twitter, they probably ought to start erring more on the side of excessive propriety. (That horse may have left the barn never to be corralled again, however…)
If they kick people off for expressing traditional religious beliefs that were well-defined before anybody ever thought of Twitter, it is time to start ignoring Twitter. If they are just enforcing the old ideal that polite society only stays polite if it stays off the topics of religion and politics…well, good luck with that. The weather used to be a safe topic, but even the weather is politics now.