Though not a model Christian, and certainly no biblical scholar or theologian, you do consider yourself Christian. They are trying to do you good. You may not like their methods or message, but they mean well. Their inquiries are calculated to assess your salvation state. Presuming you flunk their test don't allow them to make you feel spirituallyinadequate and in need of what they offer.
Dialogue means a two-way sharing of ideas in an atmosphere of mutual respect.
You'll soon learn that they have little interest in your views. They do not expect to find spiritual nourishment in your statements. It is possible for persons of differing religious views to share ideas without attempts to trap or demean each other. Such an exchange can stimulate growth of both participants. And they feel very strongly that they, not you, are the authority on Christ.