笃信

dǔ xìn bù yí

笃信不疑

unshaken in one's belief

dǔ xìn zōng jiào zhī rén

笃信宗教之人

profoundly religious person

tā yī shēng háo wú bǎo liú de dǔ xìn shàng dì

她一生毫无保留地笃信上帝。

All her life she had implicit faith in god.

gāi zú qún bù xìn yǎng xiǎo chéng fó jiào ér dǔ xìn chuán tǒng de yuán shǐ zōng jiào

该族群不信仰小乘佛教，而笃信传统的原始宗教。

They do not believe in Hinayana but in the primitive religion.