When you subscribe directly with Up Faith & Family (definitely the recommended to subscribe to anything; i.e., bypass third parties like Roku) you can use the stand-alone app. Search "Streaming Store" for it and you'll see two options - you want the one without "on The Roku Channel" on the icon. Add their app and when you launch it you can sign in with the credentials (usually email address and password) that you've established with them. Don't be misled by the suggestion to use your Roku account email that it's asking for your Roku account password. Use whatever email address and password you'd use on Up Faith & Family's website.
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