I also require proof
The Disciples were skeptics themselves, who demanded proof, only believing when tongues of fire landed on their heads. Why doesn’t God do that to everyone? Why is it now a sin to insist on proof before belief? Even Abraham asked for evidence and again God obliged. I’m pretty sure anyone who has a tongue of fire land on their head is going to be a believer. If God really wanted us all to go to heaven, it would take very little effort to make it happen.