I find the best thing to do in these situations is go straight to the word of God because he makes everything better always. Here's what I would look at if I were in your position right now about people slandering me ( and trust me i've been in that situation )
Joshua 1:9
"Have I not commanded you? Be strong and courageous! Do not tremble or be dismayed, for the LORD your God is with you wherever you go."
Isaiah 40:31
Yet those who wait for the LORD Will gain new strength; They will mount up with wings like eagles, They will run and not get tired, They will walk and not become weary.
Isaiah 41:10
'Do not fear, for I am with you; Do not anxiously look about you, for I am your God. I will strengthen you, surely I will help you, Surely I will uphold you with My righteous right hand.'
John 16:33
"These things I have spoken to you, that in Me you may have peace. In the world you have tribulation, but take courage; I have overcome the world."
Matthew 11:28-30
"Come to Me, all who are weary and heavy-laden, and I will give you rest. "Take My yoke upon you, and learn from Me, for I am gentle and humble in heart; and you shall find rest for your souls. "For My yoke is easy, and My load is light."
Keep strong dig your nose into you're bible because the word of God can be and should be your sheild! no weapon against you can prosper !!!
This on in particularly helped me :
Psalm 27
The Lord is my light and my salvation; whom shall I fear? the Lord is the strength of my life; of whom shall I be afraid? When the wicked, even mine enemies and my foes, came upon me to eat up my flesh, they stumbled and fell. Though an host should encamp against me, my heart shall not fear: though war should rise against me, in this will I be confident.
Don't feel discouraged for doing what the spirit tells you to do. Feel ENCOURAGED because you did do what the holy spirit told you to do. If you do feel discouraged pray. ask god for peace and have faith in your heart that he will give you peace. " Ask and you shall receive "
About the persecution of faith I would also dig into my bible, where Jesus says " if the world hates you remember it has hated me first " If you can't find a good church go on an internet church, I could give you some suggestions if you like! I found Bishop T.D Jakes really helped me through the kinda things you seem to be going through right now. I hope I helped you at least a little ! God bless you, remember in Romans 8:28 “And we know that all things work together for good to those who love God, to those who are called according to His purpose.”
Stay strong don't let the enemy win !! Greater is he that is in you that is in the world.