What do you do when an inquirer wants to get to the “nitty-gritty” about the Catholic Church and “God” and does not really want to faith share or hear other’s stories about God in their life?

In the precatechumenate, the inquirer sets the agenda. So I’d answer whatever questions he had, nitty, gritty, and otherwise. If he wants to get baptized, he will eventually need to learn to grow in and share his faith. It is a prerequisite for celebrating the Rite of Acceptance. See paragraph 42. He can remain in the precatechumenate for a long as he needs to, asking whatever questions he needs to. However, until he shows the beginnings of a spiritual life, he cannot be a candidate for the Rite of Acceptance.