You may have quit believing, you may believe these people are correct, yet no one can prove Christianity wrong, can not prove there is no after life and can not disprove heaven or hell and neither can you. The Holy Spirit is working with you and you can choose to listen or ignore Him, it's totally up to you. God is giving you another chance, what you do with it is up to you. Nuff said, I'm not preaching to you, an observation is all.
God loves those who believe and those who do not and the same goes for me, you have no choice in this matter. That puts the matter of total free will to rest.