Repentance from major sins

Q:

1. Would Allah accept salah of a person who commits major sins?

2. Would Allah accept salah of a person who gives and recieves interest (ribaa)?

3. Would Allah accept good deeds like salah of a person whose in debt?

4. Is it true if you miss 3 jummah(Friday salah) you lose your religion?

5. Does Allah accept repentance from a person who doesn't pray salah?

Mistakenly scratching someone's car

Q: What is the procedure in the following case:

I was at a parking lot. Just as I opened my car door, a strong wind blew it onto the car next to me and scratched the car abit and cracked the indicator light. I was scared and wasn't sure what to do. I considered leaving a note along with some money on the windscreen but I was afraid and drove away. Now it's really playing on my conscience. Please advise.