I think the only person who is confused here is you. But I will admit that nobody yet has tried to break down the source of your confusion, or correct some of the fallacious logic you are using. Therefore, let me try to give you a response that is more commensurate with what you are looking for. Let me preface my response to everyone of the Old Testament passages you are quoting by saying this: the commandments of the Old Testament were part of a covenant between God and the Israelites. The Jews were his chosen people, and given specific laws that applied to them alone. He gave no such laws to the Gentiles. So on that basis alone, you cannot hold Gentiles accountable under the Old Covenant (to which they were never part of). Secondly, anyone who calls themselves a Christian is under the New Covenant, established by Jesus Christ. It is HIS commandments and his interpretation of the Old commandments that were are held accountable to, not the laws of Moses or Abraham.
Having said that:
All of the passages here are taken out of context. I'll give you several examples of where you went from what the text actually says and ignored the context, and came up with a false interpretation of it.
Kill all the inhabitants of any city where you find people that worship differently than you. Deuteronomy 13:12-16
Here's what the text ACTUALLY says:
Deuteronomy 13:12-16
12 If you hear it said about one of the towns the Lord your God is giving you to live in 13 that troublemakers have arisen among you and have led the people of their town astray, saying, Let us go and worship other gods (gods you have not known), 14 then you must inquire, probe and investigate it thoroughly. And if it is true and it has been proved that this detestable thing has been done among you, 15 you must certainly put to the sword all who live in that town. You must destroy it completely, both its people and its livestock. 16 You are to gather all the plunder of the town into the middle of the public square and completely burn the town and all its plunder as a whole burnt offering to the Lord your God. That town is to remain a ruin forever, never to be rebuilt
So what is this passage actually saying and why? First of all, does it say what you initially implied? To kill inhabitants of ANY CITY? NO. It says to destroy their own city (a Jewish city) where the people have gone astray and turned away from God. Why does it say that? Because allowing such a city and it's inhabitants to prosper would eventually lead to the corruption and destruction of ALL Jewish people.
Kill everyone who has religious views that are different than your own. Deuteronomy 17:2-7
Here is what the text actually says:
Deuteronomy 17:2-7
2 If a man or woman living among you in one of the towns the Lord gives you is found doing evil in the eyes of the Lord your God in violation of his covenant, 3 and contrary to my command has worshiped other gods, bowing down to them or to the sun or the moon or the stars in the sky, 4 and this has been brought to your attention, then you must investigate it thoroughly. If it is true and it has been proved that this detestable thing has been done in Israel, 5 take the man or woman who has done this evil deed to your city gate and stone that person to death. 6 On the testimony of two or three witnesses a person is to be put to death, but no one is to be put to death on the testimony of only one witness. 7 The hands of the witnesses must be the first in putting that person to death, and then the hands of all the people. You must purge the evil from among you.
Does this say to kill anyone who has religious view different from yours? NO. It says to kill people living among you (ie: the Jewish people, in the Jewish nation) who are VIOLATING THE COVENANT! Can Gentiles violate a covenant they were never pat of? NO. Does the scripture say to go out and kill people who have different religions? NO. The scripture is talking about Jews, living among other Jews, who disgrace their own God, and compel others to follow them.
Kill anyone who refuses to listen to a priest. Deuteronomy 17:12-13
Really? Let's see:
Deuteronomy 17:12-13
12 Anyone who shows contempt for the judge or for the priest who stands ministering there to the Lord your God is to be put to death. You must purge the evil from Israel. 13 All the people will hear and be afraid, and will not be contemptuous again.
So apparently, it has nothing to do with failure to "listen to a priest", but of actually showing contempt for the priest in public while that priest is ministering to the Lord. Seems like a very different charge doesn't it? And why? Well, this passage actually tells you why this commandment was given!
But for aforementioned reasons, none of these passages have any relevance for any Christian living today, because A) we are not Jews, and B) we are under a new Covenant.
Hebrews 8:6-13
6 But in fact the ministry Jesus has received is as superior to theirs as the covenant of which he is mediator is superior to the old one, since the new covenant is established on better promises.
7 For if there had been nothing wrong with that first covenant, no place would have been sought for another.
8 :The days are coming, declares the Lord, when I will make a new covenant with the people of Israel and with the people of Judah.
9 It will not be like the covenant I made with their ancestors when I took them by the hand to lead them out of Egypt, because they did not remain faithful to my covenant, and I turned away from them, declares the Lord.
10 This is the covenant I will establish with the people of Israel after that time, declares the Lord. I will put my laws in their minds and write them on their hearts. I will be their God, and they will be my people.
11 No longer will they teach their neighbor, or say to one another, Know the Lord, because they will all know me, from the least of them to the greatest.
12 For I will forgive their wickedness and will remember their sins no more.
13 By calling this covenant new, he has made the first one obsolete; and what is obsolete and outdated will soon disappear.
How do we know that this new covenant is also one established with Gentiles?
Romans 2:14-15
14 Even Gentiles, who do not have Gods written law, show that they know his law when they instinctively obey it, even without having heard it. 15 They demonstrate that Gods law is written in their hearts, for their own conscience and thoughts either accuse them or tell them they are doing right.