Christ did not teach pacifism. In both the old and the new testaments the bible teaches that man are not only to defend themselves but also to defend those whom God has given them responsibility over.
Exodus 22:2-3 tells us "If the thief is found breaking in, and he is struck so that he dies, there shall be no guilt for his bloodshed. If the sun has risen on him, there shall be guilt for his bloodshed. He should make full restitution; if he has nothing, then he shall be sold for his theft."
In Proverbs 25:26 we read that "A righteous man who falters before the wicked is like a murky spring and a polluted well." Certainly, we would be faltering before the wicked if we chose to be unarmed and unable to resist an assailant who might be threatening our life. In other words, we have no right to hand over our life which is a gift from God to the unrighteous. It is a serious mistake to equate a civilized society with one in which the decent people are doormats for the evil to trample on.
We must also consider what Christ told his disciples in his last hours with them: "...But now, he who has a money bag, let him take it, and likewise a sack; and he who has no sword, let him sell his garment and buy one" (Luke 22:36).
Years after Pentecost, Paul wrote in a letter to Timothy "But if anyone does not provide for his own, and especially for those of his household, he has denied the faith and is worse than an unbeliever" (1 Tim. 5:8). This passage applies to our subject because it would be absurd to buy a house, furnish it with food and facilities for one's family, and then refuse to install locks and provide the means to protect the family and the property. Likewise it would be absurd not to take, if necessary, the life of a night-time thief to protect the members of the family (Exodus 22:2-3).
The wisdom of the framers of the Constitution is consistent with the lessons of the Bible. Instruments of defense should be dispersed throughout the nation, in the hands of its citizens. In a godly country, righteousness governs each man through the Holy Spirit working within. The government has no cause to want a monopoly of force; the government that desires such a monopoly is a threat to the lives, liberty and property of its citizens.
(From
http://gunowners.org/fs9902.htm)