C.S. Lewis has some good stuff. Also read a book called The Language of God that was good. He compared apologetics to a map to Florida. You can get to Florida without a map, but you probably won't. And if somebody doesn't want to go to Florida, you can give them a map but can't convince them.
I would focus on how Christianity is different:
1. Jesus said he was God, other spiritual leaders such as Buddha, Muhammad, etc. were trying to find God. But Jesus was God finding man.
2. The testament and deaths of the disciples. They weren't just dying for something they believed in. They died because they claimed to see Jesus rise from the dead. Why would some of the most intelligent men of the time die for a lie? They had literally nothing to gain from it.
3. The universe is random and can't be guessed, much like Christianity. So if someone believes in God, they would have to agree God did not make this universe for us to inherently understand everything.
4. If Jesus lived (99 percent of hisotrians agree he lived) and said he was God (once again 99 percent agree), he was either a crazy, sociopath liar or he was God. He could not have just been a teacher or leader if he said he was God. A good teacher or leader would not say such a thing.