Why?
Even if this is true I don't see that this implies you need to believe in God to have access to all there is. If our senses are not enough maybe a microscope or something like it will do
I am not sure I know what you mean here.
Is the "something" you refer to God?
If you feel that God exists rather than not exists, then you should probably examine why you feel that way.
It is a very subjective argument though, and on its own is rather pointless as I see it.
This makes no sense to me what so ever.
What is important is that you and the person you interact with agree on what is right and wrong. You don't need God for that.
I agree that you need a basis, but again, I don't see where God comes into this.
About the objective basis you refer to:
God (if such a thing exists) does not seem to be very good at communicating clearly for all to understand what is right/wrong/good/evil, so using God as an objective reference point seems rathet silly to me.
The only reason I can see for a person to believe in God is if that person has had an experience where he or she has clearly felt Gods presence or better yes has in some way communicated with God.