Can't we all just get along? No, sadly we cannot. Though communities often start out small with everyone agreeing and holding hands, divisions can come up pretty quickly. The early Christians found this out the hard way. From its humble beginnings gathering in an upper room, the church expands throughout the world, and with its expansion come problems and arguments. Acts is filled with growing pains.
No one likes to see a miscarriage of justice. That's why the disciples of Jesus get lots of sympathy in Acts. They keep getting arrested on trumped up charges and accused of saying things they never said and breaking Roman and Jewish law. Luke wants us to know that they're totally innocent (just like Jesus), but that everyone has it out for them anyway. In the end, lots of Christians die. They fought the unjust law and the unjust law won… for a few hundred years anyway.
No one likes to suffer. If we could, we'd all walk through life skipping and eating ice cream cones. Every day can't be all good times and delicious desserts, though, and the early Christians knew this first hand (and how). Throughout Acts, they are attacked, beaten, imprisoned, and sometimes killed for saying (really loudly) that Jesus is Lord. It sucked, but it also got people thinking. This Jesus guy must be pretty darn awesome if people are willing to die for him, right?
Religion is a powerful thing. Individual faiths build up traditions, customs, writings, and a history that people get pretty darn attached to. In Acts, the disciples are proud of their Jewish heritage, but also trying to get people to see those old traditions in a new way. They believe that scripture predicted that Jesus would come and be the Messiah. They also think that it's cool for Gentiles to get in on the action and (while they're at it) not follow the whole Torah. It's not a popular idea. Old traditions die hard.
Truth isn't all about listing off facts and figures. When the disciples talk about truth in Acts, it means they know things about God that the rest of us don't. Jesus told them about a whole different spiritual reality ordered by God and unknowable by the ordinary world. Impressive, right? The disciples are pretty psyched about it—enough to die for what they think is true. But how do they know—really, truly know—what God wants? Good question. It's what the world has been debating for the last two thousand years.