Hawking is dead. He does not "now know the truth about creation." In fact, he knows nothing right now. He does not have an invisible body part that instantly went to meet with an invisible god. This part having now taken over for his dead mind, and it's called a "soul" by the numb believers who just keep on making things up. That is how we have gotten to this point where we are today. The faithful make it all up.
Oh, it offends you. Then don't read it or talk to me about it.

How close are you and your sister? Is this worth your relationship?

Your sister says that she finds your comments hurtful and you continue to discuss how bad christianity and christians are. Is her christianity, and your opposition to it, more important to you than the family relationship that you share? What is the source of your opposition to christianity? If you feel that you were badly treated by one or more religious folk in the past, no current christian is to blame for that, in the sense that they have not affected you. The anger displayed in your comments no doubt is visible to your sister and the fact that her faith is critical to her identity will lead her to experience pain. I don't think most average christians are fixated on hoodwinking others. They truly think that what they believe in is something that everyone should have.

Perhaps you could post anti-Christian stuff in a different venue. Perhaps you could include a headline that says, "Christy don't read this" (or whatever her name is), when you post such material. Perhaps you can talk about events or actions, not just "christians" as a generic term. A minister or priest did this or that, a school or church took these actions, etc. That way you are focused on something that is NOT christianity in general, but on specific issues that may be easier for her to understand.

He was a smart man. Sorry that he’s gone

It's a war on bad ideas, while most Christians have abandoned many biblical bad ideas, but they still have some work to do and as long as some continue to hold to these bad ideas others will be culpable for their overt silence on the matter. Ironic how they are easily affend by criticism, but don't care one bit that their venom not only offends, but poisons.

Apologize for any upset and note that causing distress was unintentional and move on.

Tell her to block you as you both have views that are very differnt and you can keep in contact other ways like she did with the phone.

So to do a comparison here. There is toxic masculinity and then there is masculinity. I will call out toxic masculinity. Then I will masculinity (like men being good dads)

Anyways if you wanted to compromise you could start saying toxic Christianity. It’s a little different because people choose to be Christian while men don’t choose to be men. Just an option.