I understand, and don't wish to disrespect the religious practices of others. But it makes zero sense to me. G-d could also easily be taken as an abbreviation for ---damn.
And Quix, while it's true God knows our hearts, we must operate here in the physical world and are not privileged to know the hearts of strangers. God is a beautiful word, a beautiful concept, a comfort to pray to, and I just can't grasp wanting to hide any part of Him.
It used to bug me a lot, too.
So much that I'd even tend a bit to spell GOD out in all caps to sort of rub it in their faces.
God made very clear to me I was wrong.
Not that He'd insist I follow their practice but that I have respect for it.
For them, it's that God is SOOOOOOO HOLY, they are not worthy to spell it all out.
Emphasizing God's Holiness is not a bad thing.