You cited part of that verse to support your statement: Obviously, catholicism is a lie and hence, of the devil. And all who promote and defend that false religion are liars and are of their father, the devil.
Go ahead, include the rest of the verse that shows what you did:
John 8:39-44
39 “Abraham is our father,” they answered. “If you were Abraham’s children,” said Jesus, “then you would do what Abraham did.
40 As it is, you are looking for a way to kill me, a man who has told you the truth that I heard from God. Abraham did not do such things.
41 You are doing the works of your own father.” “We are not illegitimate children,” they protested. “The only Father we have is God himself.”
42 Jesus said to them, “If God were your Father, you would love me, for I have come here from God. I have not come on my own; God sent me.
43 Why is my language not clear to you? Because you are unable to hear what I say.
44 You belong to your father, the devil, and you want to carry out your father’s desires. He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies.
and again, please share what you know to be true religion.
Yoits, old Beelzebub and her countless minions are licking their chops waiting to receive you in the flames, my bigoted little man (or woman)! To escape eternal punishment you need to immediately contact the closest priest and have him hear your disgusting confession. Even after you do that you still may be sent to Purgatory for several centuries. So cease your lying and say a few decades of the holy Rosary and, perhaps your Blessed Mother will ask her Son to go easy on you!