There are some the say the mark genetically changes your DNA to the point you are no longer "human" and no longer savable. I don't even know if that is possible.The point of asking the three questions I asked, is that they all are defined as having eternal life, meaning nothing can harm them ever again. "It is finished."
But most simply do not understand what it all means--what the mark of the beast is--and try to imagine what it might be, usually as something future because they have yet to actually figure it out or have it revealed to them. In fact, I could just say what it is right now and most for unbelief would simply deny it and remain in that place of not understanding...preferring to be among those who "did not receive the love of the truth, that they might be saved."
My point was that if you're a christian...become one during the tribulation I would think you know what's going on and the only way you'll take the mark is if you are held down and physically forced. If that is how the mark is delivered and how you received it I don't think God going to send you to hell for having it forced upon you.