Children of God must be taught the word of God so they can learn who God is, what God has done, what God is doing, and what GGod will do, what God wants from them and for them. It is only by faith in Christ and learning the word of God and learning to obey God that they can become who God has called them to be.

Love it! It does not get more blunt than this! :)

But even so, I thought I would look at what the Bible teaches…

The old Testament is explicit about defending self and family.
Nehemiah 4:14-18

14 When I saw their fear, I rose and spoke to the nobles, the officials and the rest of the people: “Do not be afraid of them; remember the Lord who is great and awesome, and fight for your brothers, your sons, your daughters, your wives and your houses.” 15 When our enemies heard that it was known to us, and that God had frustrated their plan, then all of us returned to the wall, each one to his work. 16 From that day on, half of my servants carried on the work while half of them held the spears, the shields, the bows and the breastplates; and the captains were behind the whole house of Judah. 17 Those who were rebuilding the wall and those who carried burdens took their load with one hand doing the work and the other holding a weapon. 18 As for the builders, each wore his sword girded at his side as he built, while the trumpeter stood near me.

The old Testament is explicit about defending property and self and family when a thief breaks in.
Exodus 22:2-3

2 “If the thief is caught while breaking in and is struck so that he dies, there will be no bloodguiltiness on his account. 3 But if the sun has risen on him, there will be bloodguiltiness on his account. He shall surely make restitution; if he owns nothing, then he shall be sold for his theft.

Jesus told his disciples to purchase a sword to carry in Luke 22:35-26.

35 And He said to them, “When I sent you out without money belt and bag and sandals, you did not lack anything, did you?” They said, “No, nothing.” 36 And He said to them, “But now, whoever has a money belt is to take it along, likewise also a bag, and whoever has no sword is to sell his coat and buy one.

This is implicit consent to allowing the disciples to defend themselves. But notice that Jesus told Peter to not use the sword for defending Jesus, as the scripture had to be fulfilled:

Matthew 26:51-56

51 And behold, one of those who were with Jesus reached and drew out his sword, and struck the slave of the high priest and cut off his ear. 52 Then Jesus said to him, “Put your sword back into its place; for all those who take up the sword shall perish by the sword. 53 Or do you think that I cannot appeal to My Father, and He will at once put at My disposal more than twelve legions of angels? 54 How then will the Scriptures be fulfilled, which say that it must happen this way?”

We are also are not to be violent just for violence sake. As we’ve seen, those who live by the sword will die by it.
God hates those who love violence.
Psalm 11:5

5 The Lord tests the righteous and the wicked,
And the one who loves violence His soul hates.

Neither are we to take vengeance.
Romans 12:19

Never take your own revenge, beloved, but leave room for the wrath of God, for it is written, “Vengeance is Mine, I will repay,” says the Lord.

I can’t find evidence of defending your family in the New Testament. But I think the ideas from the Old Testament apply. But do not forget that Jesus said it was ok to have the weapon, implying self-defense, he also said those who live by the sword will die by it. Again, the role of government is to frighten evil doers and to practice wrath against those who do evil (Romans 13:4). Because of that, I’d do everything possible to let the people God put into place to handle such a situation do what they were called to do.

Am i supposed to stand by and let it happen. Or should i interviene risking my own life and even use leathal force resulting in his daeth if need be ?

About being unequally yoked, you are correct. I think a man and a woman must be very careful about who they choose to fall in love with and marry. In fact, I think this is a big part of why so many people divorce – they did not check out the prospective spouse before they allowed feelings to enter into things, and once they saw something or were told something that should have been a big red flag, they were too deeply emotionally entranced to be able to recognize the truth or to do anything about it.

I think people have a difficult time obeying God because they have a small view of God, and are sinful creatures who want their own desires. We all are like that. The question is are we wiling to submit to GOd or to the world’s thoughts about right and wrong.

If following the sense of mankind was a better option than more marriage would be successful now.

Also to the person earlier who said now we are living longer than people back in Adam and Eve’s time. I think you may want to research that a big more. Some of those people were living for hundreds or years. I am glad that God knew it wise to shorten our days as sin became worse because I would think our world would be hell if some of the old people in power now lived that much longer.

There is nothing new under the sun. All sins men gravitate towards existed in antiquity, there are just some people who want to believe they invented their particular flavor of behavior and so somehow that makes it exempt from what God has said.

It doesnt work that way. There were gay unions in the ancient past just as there are gay unions now. This doesnt change what God has said: dont do it.