But do you KNOW you have eternal life? Will you go to heaven when you die?
Provide your source where Jesus stated that we would know conclusively that we will enter Heaven before our death and the judgement by Jesus? Jesus has great mercy, yet he is a just judge.
How does one know whether they have unconfessed mortal sins now or in the future which would prevent someone from entering heaven?
Christ warns not to take the easy path that leads to destruction, as few will find the narrow gate. Mt 7 and then He warns about false prophets.
Are you sure salvation is guaranteed if one ignores John 6:53? How is someone sure of entering Heaven if they reject some of the revealed Truths that Jesus taught us?