That is a really limited - sad - concept of what loving God means.  The church made a rule, playing on the fears of people who, through most of history, were uneducated, illiterate, and had no way of accessing the scriptures for themselves.  It made a rule, meant to scare people into church on Sunday.

But now, people read the gospels themselves.  They know that the commandment is to "keep holy the Lord's day", a commandment issued long before christianity developed.  It certainly was not a command to go to mass on Sunday.  They know that Jesus never said "Thou shalt go to mass on Sunday". They know that the mass did not exist.

They know that Jesus did issue two commandments to love.  Loving God does not require going to mass on Sunday. Some may find the ritual helps them to love the rest of the week. Others may find a different way to "keep holy" the Lord's Day.  If the love is there - going to mass because of love - skipping mass to do something else for love - God is OK with it.