It is said that according to the Mahāyāna doctrine, every sentient being is able to attain Buddhahood. Is there any connection between Popular Buddhism and the attainment of Buddhahood?
据闻，大乘佛法说一切众生都能成佛，这种人间佛教，和成佛有什么关系？

Mahāyāna Buddhism, indeed, believes that every sentient being is able to attain Buddhahood, but first, one must be a good and pure person. Only on the basis of being a good person, can one learn from Buddhas and attain Buddhahood. Just as Sākyamuni puts it,
大乘佛教是说一切众生都能成佛，但成佛必需先要做个好人，做个清白正直的人，要在做好人的基础上才能学佛成佛。这就是释迦佛说的，

　Do no evil,
“诸恶莫作，

　Do all that is good,
众善奉行，

　Purify your own mind,
自净其意，

　This is all Buddhas' teaching.
是诸佛教。”

　What is meant by learning from Buddhas? It means to follow the Bodhisatta code of conduct. This is how preceding Buddhas attained their Buddhahood. For us too, to learn from Buddhas is just to follow the Bodhisatta code of conduct.
怎样叫学佛？学佛就是要学菩萨行，过去诸佛是修菩萨行成佛的，我今学佛也要修学菩萨行。