I've never been too clear on how Christians - especially non-trinitarians - differentiate between the father and the son, and seem much more focused on the son
Well, as you know I'm Trinitarian (which means that for me: "
The Father is that which the Son is, the Son that which the Father is, the Father and the Son that which the Holy Spirit is, i.e. by nature one God" (
Council of Toledo XI); "
Each of the persons is that supreme reality, viz., the divine substance, essence or nature." (
Fourth Lateran Council (1215)).
So, I cannot really speak for fellow Christians who think about the Deity in a very different way, although I would be fascinated to read their response to your question.
But I will say - and I'm speculating here - that the "Father" may be perceived as more removed from a believer's daily life (even though He is ultimately addressed in all public prayers, first and prior as the ultimate 'source') and indeed from the exigencies of existence in general - since He is (from the human perspective) utterly transcendent, imperceptible and ineffable. I mean, He is described as "
one God and Father from whom all things are", whereas the Son is "
one Lord Jesus Christ, through whom all things are" that has become incarnate as a human being and whom we can thus directly relate to more readily as a result; whilst the
"one Holy Spirit [is] in whom all things are", that is immanent,
Wisdom 12:1-6: "
For your immortal spirit is in all things" and is acclaimed in the creed as having
"spoken through the Prophets".
Consider:
“Far removed is the Father of all from those things which operate among men, the affections and passions. He is simple, not composed of parts, without structure, altogether like and equal to himself alone. He is all mind, all spirit, all thought, all intelligence, all reason” (St. Irenaeus (Against Heresies 2:13:3 [A.D. 189])
"It must not be supposed then that God is a body, or in a body, but a simple intellectual nature, admitting of no addition at all. There is in Him no greater or less, no higher or lower, for He is the Monad, the Unit, Mind, the Fountain of all mind." (Origen (De Princiipis i.1.6 [A.D. 220])
Maybe, in a sense, the Son and Holy Spirit can feel closer to the Christian's daily life or less 'alien'? Or just more 'relatable' or something?