Inasmuch as I am a hardcore defender of the Second Amendment, I am not sure where you are coming from.
Have you heard my use of the First, Second and Third as a demonstration that the Founders looked to French history as their rationale for the Bill of Rights? Taken together those three amendments even support the idea that the Founders were desirous of protecting America as a "Protestant", not just "Christian" nation.
In the interest of clearing up some misconception, I'd like you to cite the post where I said that.
As for defending the Second Amendment, show me where I have not.
As for 'victims', I see firearms as a means of preventing one from joining their ranks. While that does not stop good, honest, people from becoming victims through the criminal use of firearms, it does level the playing field somewhat. If this six foot, two hundred pound 'child' was harassing or even terrorizing someone, then he placed himself in harm's way. While I cannot argue (in absence of the facts) that the punishment is in any way appropriate for the crime, the fact remains that if the 'child' had not been there, he would not have been killed.
Certain legal constraints have been applied to the use of deadly force, at a minimum, these should be observed. Consider them Rules of Engagement.
As others have pointed out (and I agree), just because the legal parameters are met, there is not necessarily sufficient moral cause to use lethal force. Beyond the legalities, moral or other issues may apply, depending on the individuals involved.
This in no way abrogates the Right to Keep and Bear Arms, merely urges the responsible use of those arms.
As for Christianty being a founding force in the formation of this nation, the fact is pretty obvious when one considers that several colonies were founded to escape religious persecution, by Catholic and Protestant denominations alike. The Magna Carta and English (pre- and post-Anglican)Common Law were definite factors in the attitude of the Founders toward individual rights, even though those rights were not conferred on everyone equally.