I don’t understand how some people can be atheist, it’s so unlogical. Everything around you doesn’t show up without someone creating it, so why do you believe so about the whole world? Just looking at how the body of an animal or a human person works is so incredible and so amazing and complicated that all of this cannot be just a cosmic accident.
Anyhow, Jesus says, as I quote from the Bible from John 14,6: "Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.”
Practically this means that anyone who doesn´t believe in Christ who have been given the possibility to do so, won´t be able to go to Heaven.
Your Catholic father cannot grant you any sort of salvation. I think he tried to do so out of love for you, but it´s not good that he tried to say so. Whether you choose to follow Christ in this life you are given or not is essential. Your choice during your life affects your whole eternity. This is why choosing Christ in our lives are so incredibly important for us as Christians.
God loves you and wants you. He wants to save all people, and He definitely wants to save you. He is constantly hoping for you to get to know Him and believe in Him.
I will pray for you tonight. If you may have any questions I could possibly help you with then just send me a message