Your email address, and nothing else. There is no name field, no tracking of what you read and no profile built about you.
To send you the free book, and at most one email a month about the series. Nothing else.
MailerLite, an email service provider, stores the address and sends the emails. It is not sold, shared or passed to anyone else.
Every email carries an unsubscribe link at the foot. One click removes you, and the address is deleted.
Messages sent through the contact page are delivered by Formspree and forwarded to a personal mailbox. They are not added to any mailing list.
Write to contact@christianityunearthed.com.