Better terminology for "Father and Son" ?

[Drich]

Usage of the term in this era is misleading to your contemporaries, however.  

you mean everyone in the west. because middle eastern and far eastern cultures still hold on to this type of relationship. where the Father is the head of the house, meaning the task master the slave driver and the house must work together to farm, heard or whatever they do for a living. It is only in the west where people can do what they want that seperates the family into the dear old dad model you are use to seeing.

They hear "Father and Son" from a pulpit and they are going to think of dear old dad and themselves as the reference standard, two distinct individuals, and their resultant understanding of the Trinity will be incorrect and their resultant belief will not garner Salvation as they are denying, unaware, and mistaken about  the true nature of Christ as, you note, it has been revealed in Scripture.

Indeed... which is why I think Christianity is failing in those who do not take more effort than a cursory glance at it. Pride tells them Christian is "E,F,G" and they never see E,F,G working in real life... therfore Christianity is dead.

And as always, it's even worse for the Mormons.  If you have a copy of the Tanner book, read the chapter on their idea of how all that  works as revealed (confusingly) by Joe Smith, and further scrambled by Brigham Young.  I'd hold open the possibility God Himself  might be perplexed as to what to do with Mormons as even He won't be able to make heads or tails of it.  It's VERY clear the Mormons can't.  They might even be impervious to a revisional revelation as we might expect the new revelation to note where the current belief is lacking and how it should be modified, and they won't be able to process that.

But as with the Parable of the talents, God only holds us responsible to what he has given us. Now if the morons have not been given the "5 talents" of understanding you have been given does not mean their efforts will not be welcome. It is not up to us to decide how many 'talents' they've been given nor if they doubled their investment or whether they burried it in the sand. That is upto God.