I would have thought it obvious that if you reject Jesus after knowing about Him, you will vastly reduce your chances of entering Heaven. Jesus came to save us from Sin and death.
1. If you mean hell, why not say so?
2. Why does rejecting Jesus vastly reduce your chances of entering heaven?
3. Does this apply only to disbelievers in all religion, or to Jews, Muslims, Sikhs, Buddhists, Hindus, Jains ... in fact members of all other religions?
4. Why didn't you say this the first time?
5. This only has traction if you buy into the Christian package, which I do not.
6. There's no such thing as sin.
7. Every living thing dies. No exceptions.