I've read the Bible many times. If other people have different views on what the truth is, from reading the same passages, then how will I know if I have the truth from reading those same passages? I hope this question makes sense.
Yes, the question makes sense. I'll start by saying that many times people did not arrive at their conclusions of Bible truth from honestly reading the Bible. They jumped to conclusions after hearing a preacher preach on a text or topic who was too quick to come to a conclusion and too quick also to publish his bad conclusion. Do you see the cycle this causes?
Most deception does indeed happen because 1) People don't really study the Bible carefully and examine what they hear by it. And 2) (not necessarily unrelated to the first) People don't/won't walk in the truth that they know. This darkens their heart, causes light to be withdrawn from them, and opens them also to further deception. 3) (Not unrelated to the first two but worth a separate category) People are content with the status quo that they're currently in. So when their church is wrong they stay with the error; and then when they're not comfortable with the status quo anymore, they walk away from church altogether or they find a new church based on the comfort and convenience of the status quo of that church.
But there are exceptions, not everyone is always in one of these 3 categories; and people can and do wake up and get serious and honest with the Bible. And among such people there can be correction and edification which results in a true, biblical unity. I have seen this, though I've seen much of what you've seen too.
Furthermore I'll say that the Bible is indeed an objective book that any two people can independently arrive at the same conclusions over, but a necessary aspect of this is usually that God uses people He has gifted to teach His Word and bring people to the unity of the faith which the Bible speaks of. But what if men He intends to raise up to do this don't stay faithful? They'll often not only fail in what God intended for them to do, they'll become imposters of the very thing which they should have and could have become. This happens too often. And then when one is contending for what is true and others are contending for what is false, there is the question of: Who are you going to believe? And the faithful man will usually be slandered, falsely accused, ignored, etc. Keep in mind too that there is a devil who is working to oppose the very thing you should have seen and say you wish you had seen. Have you considered that what you've seen may be proof the devil exists?
Anyways, if you tell me about a certain topic that you've seen confusion over I can tell you some objective principles for arriving at right conclusions on it that those who you saw couldn't agree likely weren't following (though you may have had a faithful witness before you that people should have listened to, I don't know, but maybe).
You also need to ask yourself honestly: Are you willing to follow consistent, definite, correct answers should you receive them? Because there is a bias in all of us (that we must overcome) which would rather we not find such answers so we can be excused in our minds from our obligation to truth and its inevitable life-shaking consequences when we heed it. Indeed, much confusion and chaos in Christendom stems from people resisting the following of the pure Truth of God's Word, which would clean them up and upset their lives in a way that they are unwilling to surrender to and trust God to help them handle. And yet often they will twist the Bible to try to say that they are being faithful rather than at least be honest enough to admit that they don't want the Word of God to rule their lives and thus own themselves to be unbelievers going forward.
Consider with all of this then what the Bible accurately prophecied about the confusion in Christendom (note verse 5) which would occur. "This know also, that in the last days perilous times shall come. For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy, Without natural affection, trucebreakers, false accusers, incontinent, fierce, despisers of those that are good, Traitors, heady, highminded, lovers of pleasures more than lovers of God; Having a form of godliness, but denying the power thereof: from such turn away." (2 Timothy 3:1-5)