This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to Adventure Bible.
Thank you for registering with AdventureBible.com!
To activate your account username and password, please click on this link or copy it into your browser. The link will automatically log you into your account. https://www.adventurebible.com/register_user/getloginlink/25493/logf/o66rk8s6