I am sure that through my faith my sins have been forgiven and I will get into Heaven. However, how can I be sure someone else will be forgiven and allowed in Heaven? Are there any good questions I can ask them to be assured of their own faith?

I would expect actually ask any questions and not try to assume anything from outward appearances. However, I am assuming that when asking the person they are answering honestly.

Also, I imagine asking these questions of someone who may have first approached me and asked how they could be assured they will get into Heaven. Perhaps someone who is first approaching Christianity or a believer who is questioning how they'll get in.