Is it bad to listen to gospel music every day when you're not really an churchy person?

not bad at all.......

No gods exist to care.  Listen to whatever you like to listen to.

I like most genres of music except Gospel Music.

Gospel music is just music.

Isn't AC/DC's Highway to Hell actually an affirmation of God's existence because Hell wouldn't exist without God?

Gospel music can be pleasant to listen to, but it does not educate about the Bible. Instead, it usually focuses on one specific belief that may or may not be explicitly stated therein.

Hell no, there is some good gospel music out there

https://www.youtube.com/watch?v=K5f6-Z71Dvw 

It is not the most direct way, but since most Gospel/Christian music is based on the bible, it can have its effect

God will take you anyway He can

Have you tried Audio Bibles?

https://www.biblegateway.com/resources/audio/

Not if you enjoy it.  Go ahead.  I have atheist friends who like Gregorian chant.  So what?

No.  It's a good thing.  Very uplifting.  I hope you will invite Jesus Christ into your life as Lord and Savior soon.  He is a faithful friend.  He died for your sins and rose again the third day so that you could avoid hell and have a home in heaven.  If you have never confessed all known sins to God and asked His forgiveness, I urge you to do so.  Just put your faith in His Son, Jesus, and follow Him as best you can.  May God bless you, dear one. 

You can listen to whatever dull music you like.