It is a universal problem for mortal incarnate Men here on earth that we are subject to disease, decay and death. Jesus offers an answer to this problem - resurrection to life eternal in Heaven.
This - in turn - puts this mortal life into a new and different perspective...
Instead of being 'the whole thing', full of difficulties, and with a bad ending; this mortal life becomes a period of learning and preparation for a better thing.
This was not supposed to be controversial!
It was assumed that people would already want eternal resurrected life in Heaven.
Christianity was just about telling people how to get them.
In other words; Jesus assumed that everybody already-wanted what he had to offer them - his job was 'merely' to tell people how to get it.
(That is, by following him. By loving, trusting, having faith in him as sheep do the Good Shepherd. So Jesus could lead each Man through death to resurrection.)
For the offer to be convincing, for people could know that Jesus really could deliver what he offered; Jesus also needed to argue and demonstrate that he was divine.
This was not supposed to need to be argued!
Once you find yourself in the position of trying to persuade people that resurrection is desirable, to justify why eternal life is better than death, Heaven better then Hell... well, the situation has become absurd!
People should only need persuading that Jesus really could provide what he offered - not that what he offered was indeed Good...
Anyone who doesn't already want life and Heaven is clearly not going to be interested in how to get them!
Note: Sin can be understood in this light. Despair is a sin because such a person does not want resurrection, or does not believe it is possible. Pride is a sin because it falsely believes that resurrection can be achieved without following Jesus. Existential fear is a sin because it is a consequence of lack of faith in the power of Jesus to save us from death - which means he will not be followed. Etc.