That youth pastor is right on the money with his message. A house divided cannot stand (Mark 3:25) and that is what's happening in the Church with all the denominations popping up all the time through people just starting a new one or breaking from a mainline group. Many of the things that break Christians from each other are little things that are ambiguous in the Bible.
Many are consumed with knowing the truth, but they forget that Jesus said that "I am the truth." (John 14:6). Truth is being united in Christ. We as Christians believe that God forgives all sin, and we as imperfect people sin all the time. Because we are sinful we can't have a perfect understanding of God, therefore we all have some things right and some things wrong when it comes to interpreting the Bible. I freely admit that some of the things that I take from the Bible may be a bit off because of my sinful nature.
Keeping both those truths in mind (that God forgives all and that we are imperfect) can create unity. We can be united in Christ because as long as we believe in Christ and that all sins (including those of misunderstandings) are forgiven. This puts us in a humble state before Christ as well, acknowledging our need for Him for understanding. To me, my brothers and sisters in Christ are anyone who has accepted Him as their Lord and Savior.
The Bible also says in Revelation 3:15 to be neither hot nor cold but to stand for what you believe is right -- and we can still do that. Read the Bible, ask for inspiration and go with what you believe God to be telling you. However, don't shun those who think differently about those debatable points. Instead, respect them and maybe even learn from them.
One thing I have learned being a journalist is that if you base everything off one source you'll probably get some wrong information... that's a direct example of human nature. But if you interview multiple people you get the whole picture. Having a greater Christian community brings you closer to Christ! You can talk about everyone's interpretations and maybe hear/think something you wouldn't have on your own or just following your denominational dogma.
So, in closing, remember to love your neighbor as yourself... and that includes your Catholic, Baptist, Lutheran, Methodist, etc. Christian neighbor. Stay strong in your convictions, but respect others' opinions on the nutty-gritty details. As long as they believe in Christ as their one and only Savior and ask God for forgiveness of their sins -- the obvious, the hidden, the blatant and yes, the misunderstandings of Scripture -- they are your brothers and sisters and part of the body of Christ
"For just as the body is one and has many members, and all the members of the body, though many, are one body, so it is with Christ.". -1 Corinthians 12:12
Check out this moving song about being united in Christ:
(I also have a few rock songs on this topic, if anyone wants links message/comment.)