Just responding to your quote that we should actively work against it. Sir, there is nothing dangerous about my belief in the afterlife. It actually brings peace to me and many other Christian believers versus believing that we will just stop existing and become dust. One of the rewards for people like myself, is that someday we will actually be reunited in Heaven with our loved ones, like my sweet little grandmother who passed away in 1998. My beliefs shouldn't be dangerous to you or anyone else. I am not standing by a school bus in Israel with a bomb on my back and waiting to make Allah proud and receive my 70 virgins. They, those terrorists follow a false God. A God that has created a culture and worship of death and that has been sweeping across the earth for centuries. It has never changed. It has always been violent and they do it in their God's name. I say their God's name, because it is not the same God that they follow. Despite the popular moral equivalency belief that the God and afterlife of Muslims is the God and afterlife of Christians, it's just not true. The work that I have done in God's name has been to give hope and share God's love with the heartbroken in my community and also on mission trips to countries like Japan. The Christian afterlife is simply not a danger to you or anyone else.
You having the idea isn't dangerous and it isn't at all my concern that you do. It is my concern that the meme causes some (a formidable amount) of people to act in ways dangerous to themselves and more importantly others. Whether they believe in some future reward, treat others with scorn and derision for worldly ways, or any other of the unlistable amounts of negative irrational side effects the idea causes in human social behavior this is dangerous at a societal level greater than a single tribe because of how it changes rational presuppositions.
A terrorist's god whether false or not simply has no bearing on the changes in the interpretation of reality brought about by a belief in an afterlife. I am not sure how to respond to your brief weighing of Islam versus Christianity but for the purposes of my previous statement which you quoted I am not interested in the specific afterlife or religious belief itself.