这幅画通过圣三位一体的形象展现了基督教的三位一体教义。

This painting depicts the ___Trinitarian Christian doctrine through the image of the Holy Trinity.

这位牧师是一位坚定的三位一体论者，经常在布道中解释这一教义。

The pastor is a devoted ___Trinitarian who often explains the doctrine in his sermons.