Reading bible, understanding what the real teachings of all religionse are at its core (be nice to each other, dont kill, help the poor, dont steal aso) and then have a look how many religiouse organisations work and how they go against their own core beliefs
Or just go full "one person was a bad person. Therefore all of this group are bad"
Then later "not all imigrants are bad just because one did a bad thing!"
Reading bible, understanding what the real teachings of all religionse are at its core (be nice to each other, dont kill, help the poor, dont steal aso) and then have a look how many religiouse organisations work and how they go against their own core beliefs