Your question is a bit ambiguous. Are you asking how to take someone who is an atheist and convert them to Catholicism? There’s no “one size fits all” for that, as it depends considerably on why they became an atheist to begin with. Or are you asking about how a former atheist can become Catholic? (obviously, if someone wants to become Catholic, they are no longer an atheist) In that case it’s the same as anyone else, go through RCIA.Assuming that this atheist doesn’t have lots of Catholic family members; how do they go from no faith to faith?
Faith is gift from God. ThereforeAssuming that this atheist doesn’t have lots of Catholic family members; how do they go from no faith to faith?