Sam,
1) Is it responsible to develop a weapon to counter those who would develop the same weapon to use against you?
2) Once the principles of projectile flight and the elastic properties of certain woods are discovered, how would you propose to prevent the development and proliferation of the bow and arrow?
As to your scientist vs engineer questions, we both engege in what is called "science". We distinguish between scientists and engineers based on the thrust of their activities. As I said, there is much overlap between the two. I'm not sure what you don't understand about this.
Comparing religion and science as methods is the proverbial apples and oranges comparison. One relies on doctrine and authority, the other relies on evidence and experiment. Which, of course, you already know.
Religion sucks hairy balls and then some for the primary reason that there is no way to validate or invalidate the doctrine or authority that guides it in a fair and objective way. This is the very reason that the deist founding fathers of the US of ABOMBS seperated the sacred and the secular.
Religion, for most, is a way to orient their personal relationship with the cosmos. It sucks hairy balls as a way to equitably run a society.