In Christianity, the Father represents the Heart and the Beloved; the Son represents the Buddhas; and the Holy Spirit represents Jivanta, or the "heart" of Jivanta present in all Living Beings.
In Buddhism, the Buddha represents the Beloved; the Dhamma represents the Heart; and the Sangha includes both the Buddhas and the Jivanta.
Thus, using Jivanta as the connecting link, we can propose the following: the Father of Christianity corresponds to both the Buddha and the Dhamma of Buddhism; the Son of Christianity corresponds to a portion of the Sangha in Buddhism; and the Holy Spirit of Christianity corresponds to a portion of the Sangha in Buddhism.
232 Christians are baptized "in the name of the Father and of the Son and of the Holy Spirit". Before receiving the sacrament, they respond to a three-part question when asked to confess the Father, the Son and the Spirit: "I do." "The faith of all Christians rests on the Trinity".
Buddham saranam gacchami
I go to the Buddha for refuge.
Dhammam saranam gacchami
I go to the Dhamma for refuge.
Sangham saranam gacchami
I go to the Sangha for refuge.