Customer who just wants to shop and go is annoyed

Customer who just wants to shop and go is annoyed
A recent shopping experience at a local major department store in the Youngstown area became more of an interrogation than a shop and go moment for me.
At the store counter, I was buying a small item with cash. The cashier asked me what my home phone number was. I told her I didn't want to give her that information. She started to get annoyed. After she rang up my item. Then, she asked for my birth date. I said I don't want to give that information either. Again, she was becoming more annoyed.
I said, "all I wanted to do was pay for my item with cash and leave."
A cashier from another aisle said to me, "the company wants my information for the fliers they send to people's home." I told her, "I get a flier in the paper, and I am happy with that."
This retail store is not the only one. At another store, an electronics store in the area is always asking for my phone number and if I want a subscription to a magazine every time I purchase items there. This constantly saying "no" has gotten annoying to me.
At this point, I've started to use the self checkout at stores. Buy, no questions and leave. I wish more stores had self checkouts.
I am already concerned about trading my privacy to save some money when I use a saving card at a local grocery store. I am sure there is information compiled about me when I use the card.
With the constant threat of identity theft looming everywhere, I just don't feel comfortable giving my information at a store counter where anyone behind or beside me can hear my information.
I feel as a shopper and a consumer of products, I should have the right to pay for my purchase and walk out without the feeling that I have given something away I shouldn't have or have that experience come back to harm me or my family.
The word 'separation' can't be found in Bill of Rights
The Bill of Rights, which we often speak of, may not say what most people are told it says.
Amendment I
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances."
Most people know that the state has no right to make or establish a national religion.
That would be wrong and I don't know anyone who wants to do such a thing.
Let's elaborate on "prohibiting the free exercise thereof."
If we are free to exercise or practice our speech or the religion of our choice, we should have freedom of speech, to speak whatever you desire when or where people choose to speak.
We also have the right to assemble or speak peaceably, anywhere.
The press has the right to write as it desires with this freedom also. We also have the same right to pray whatever we desire, when we desire, as long as we do it peaceably.
These freedoms are given to all religions and all people, whether others agree with what you believe or not.
We let some unbelieving intellects change the meaning in our Bill of Rights, and they made us believe it said "separation of church and state." I don't see where it says that.
The only separation I see is that the state must separate itself from our rights to the press, what we say or where we pray.