..., how say some among you that there is no resurrection of the dead?
This means ressurection of the dead for all of us. This isn't what you think it means.
Jesus Christ Himself spoke to those who didn't believe in a ressurection of the dead:
Matthew 22:23
That same day the Sadducees, who say there is no resurrection, came to him with a question.
Some people didn't believe in an ressurection of the dead at all so they wouldn't easily accept that Christ ressurected.
Well, you believe in a ressurection of the dead so this group isn't an "Islamic Christian" group.