The word of God is all over the place sometimes. Written by tons of different guys in different places, spanning over thousands of years. But you know that.
The thing is, sometimes prior knowledge of the writer's culture, language, and context is required to totally get some of the verses. When you study and ask pastors or older Christians, you find out there is no contradiction.
Firstly, try not to doubt your salvation. There are NUMEROUS verses that confirm it. You're all good there. Be happy, because this will only lead to a better understanding of God and the Bible. Sometimes if you aren't having doubts, it just means you aren't a threat, and Satan can't be bothered to mess with you. This is probably a good thing.
Allow me to address some of these verses for you.
"He who endures to the end will be saved." Yeah, that's just re-stating that you WILL be saved. Because when you become a Christian, nothing can separate you from Christ, right? Which means that regardless, you will endure til the end. (The end, meaning your death) It's not a verse about being perfect, or hanging on until the end to be saved. It is meant to re-assure you that while you are enduring, you can remember that you will be saved in the end. It's a reminder that God has you, that even though you are enduring now, you can remember that you have been promised salvation. Sometimes people suffer in this life for Christ. That's what is meant by "enduring". If that happens, if you endure for Christ, obviously you will be saved. The verse does not say that other Christians, who endure pretty much chump change WON'T be saved. They will too.
"if your hand causes you to sin, cut it off because you will be in danger of hell fire,it is better to go to heaven with out a hand, then not go at all."
Ok, Jesus is totally not saying to do that. That's a bit violent. BEFORE he died, he was making a point about how much more important eternal fate is than earthly comforts. He wanted to make people take sin seriously, and to see that they simply could not be perfect alone, even if they resorted to these drastic measures. He was talking to a culture and a people that would understand what he meant and would be affected by his reasoning. After Jesus made this speech, he died and rose again, and salvation was available.
You are saved, these verses don't contradict that. Remember, the Bible also says that perfect love drives out fear. Remember that Jesus loves you, so fear will eventually be driven out, and you don't have anything to be afraid of, least of all hell. Understand the verses, and believe them. Questions are good.
This is salvation. This is grace.
God cannot love you any more, God cannot love you any less. You are in. Nothing can separate you from God.
You are really and truly and completely free. There is no kicker. There is no if, and, or but. You are free. You can do it right or wrong. You can obey or disobey. You can run from Christ or run to Christ. You can choose to become a faithful Christian or an unfaithful Christian. You can cry, cuss, and spit, or laugh, sing and dance. You can read a novel or the Bible. You can watch TV or pray. You're free. Freedom threatens relugious people because it takes away their control. Does being free mean that if I don't do what God says, he will still love me? Ues, that is exactly what it means. You might get hurt or regret what you've done, but you can do it and he won't stop loving you. You won't lose your salvation and you won't get kicked out of the kingdom. The more I experience his love and grace, the more I want to please him. You ought to live your life with such freedom and joy that uptight Christians doubt your salvation. Do you know a single atheist who stayed away from Christ because a Christian didn't act as holy and sanctified as he or she ought to have acted? I know they will say we are hypocrites-but usually that is just a smoke screen. The truth is what repeatedly kills our witness is pretense, not freedom.
Live morally because it is wise, and good for you, not to earn salvation. Picture a court room with you on trial for doing something bad. The Father is the judge, satan is the prosecutor, and Jesus is the defense attorney. Satan delivers a blistering attack, with lots of evidence against you. You are guilty, no question about it. Then Jesus gets up to speak. He says, "Yes, Judge, my client is guilty, but the penalty has already been paid. By me. In blood." The Father smiles, and nods,"Paid in full. Case dismissed." That's a picture of what happens every time you sin and are accused by Satan. No doubt you know this, but it never hurts to be reminded, does it?
Whether or not you have doubts, let guilt rule you, or get scared, regardless of how you feel, this is the truth. You belong to God. No amount of doubting and no mistake can ruin that. Sometimes we forget this. Sometimes the idea of freedom can scare us, because we are used to rules and control. I've seen people totally freak out when I say, "You don't have to do anything to earn grace." I have had CHRISTIANS tell me I "go too far with grace" in my thinking. Is that possible? Isn't that the point of God's grace? That it's free and it covers everything? Anyway...
Sometimes verses are misunderstood or pulled completely out of context, and they can confuse. There are difficult passages in the Bible, but part of the experience is trusting God while you work through them.