Yea, that Security interruption from the certificate will surely do it. Good catch. The hosting site really is key when using the audio function in glide. It cost money to get a security certificate, if you have the technical know how you can do a “Self Certificate” but it may not be recognized by chrome.
a suggested workaround is to place the mp3 file on the top level directory of the church website and link to it. Make sure that the link is coming from the church website, since the church website has a security certificate already. Good Luck.