1. Is it impossible to God to exists? I am going to assume you meant "for god to exist?"
Define god?
2. If I could prove to your satisfaction the God of the bible, would you worship him?
Which bible? No matter which bible, No, why should I
3. As a christian my position is that without God you can't know anything, is it possible that you don't know anything/would you say we can know things?
There is no proof of "god"(what is god again?) and I know stuff.
4. Is it possible that our knowledge could be wrong?
Depends on who is "our", on how wrong "our" would be. Even then to much assumption. Of course it is possible more likely for me probable.
5. Can something that we don't know prove wrong what we know?
Yes, cannot see why not, but I could be wrong.
6. How you know that you reasoning is valid?
It is valid until someone can prove otherwise.
Define god?
2. If I could prove to your satisfaction the God of the bible, would you worship him?
Which bible? No matter which bible, No, why should I
3. As a christian my position is that without God you can't know anything, is it possible that you don't know anything/would you say we can know things?
There is no proof of "god"(what is god again?) and I know stuff.
4. Is it possible that our knowledge could be wrong?
Depends on who is "our", on how wrong "our" would be. Even then to much assumption. Of course it is possible more likely for me probable.
5. Can something that we don't know prove wrong what we know?
Yes, cannot see why not, but I could be wrong.

6. How you know that you reasoning is valid?
It is valid until someone can prove otherwise.