Don't you find it a little strange that you have to take it all on faith, that these score's of Angel's & Demon's work in an invisible world beyond our sight.
You should consider yourself blessed if you had no troubles with the dark forces.
Had to call on Jesus several times when demonic forces came upon me.
1 Peter 5:7 Casting all your care upon him; for he careth for you. 8 Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour: 9 Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.
It was scary, but it is hard to prove such things so I'd rather not talk about it. Just know that whenever something scary supernatural starts happening around you or coming at you, just call on Jesus for help for greater is He that is in you, than he that is in the world.
1 John 4:4 Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.
He is still in you even though you are an agnostic.
2 Timothy 2:13 If we believe not, yet he abideth faithful: he cannot deny himself.
Ephesians 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.