These booklets (small, can be read in under two hours) are JUST what you need to perfectly explain why "being a good person" isn't the answer. I bought several of them and gifted them to non-believing co-workers!
This little book provides one of the best summaries of the gospel I've ever read. It clearly explains why the idea that "good people go to heaven" is false, and presents the alternative: forgiven people go to heaven. Since most unbelievers (and many who consider themselves believers) misunderstand this issue, this is a critically important tool. Even with those who aren't yet ready to hear the whole message of the gospel, I've found myself using the truths in this little book to introduce the idea that "good people go to heaven" doesn't work. I'm finding people readily agree that is hard to figure out which set of religious rules is the right one, and it's very easy to move from that to "maybe there's another way. "
Many modern believers don't understand this truth. This book is a great way to clarify the truth, for believers and unbelievers alike. And at the price, it's also an excellent tool to purchase in bulk and carry with you to hand out when you come in contact with those who are far from Christ.