It is hard to conceptualize an event that takes place the moment one believes in Jesus as their Redeemer and their Lord. Catholics have been conditioned to think of saved as something they must strive for, seek to journey toward.
Being born from above would be hard to conceptualize with such a long drawn out process as catholic salvation. Additionally, catholics have been conditioned to believe they can lose that trail toward obtaining salvation nd have to re-up, again and again.
They’re taught that it’s a process as much as anything, instead of an instantaneous, present, done deal, reality.