Thou shalt have no other gods before me. Exodus 20:3
“Leo the Great speaks of Christians in Rome, who first worshiped the 
rising Sun, doing homage to the pagan Apollo before repairing to the
Basilica of St. Peter.”—Schaff.
As professed heathen, the sun had
been their chief god.
As professed Christians they still worship it,
but “Christianized” the custom by claiming that they were doing homage
to “the Sun of Righteousness,” the Son of God.
Sunday is and always will
be only “the venerable day of the sun,”...." E.J. Waggoner
So who Exactly was this FALSE god Apollo that so-called Christians in Rome Worshiped?
"Apollo is
one of the most dazzling, and charismatic gods of the Olympian
Pantheon; ...and had many, many lovers, both
male and female.
---Apollo shone so brightly he overshadowed Helios the
Sun God, 
and eventually became known as a Sun God in his own right.
---One
of Apollo's most important daily tasks was to harness his four-horse
chariot, in order to move the Sun across the sky.
Apollo
pursued and conquered many women, both mortal and divine, though many of
his would-be female lovers ran from his advances or committed suicide
rather than submit to him.
Apparently, Apollo was capable of absorbing the power of his lovers and goddesses, Queens, and Princesses certainly didn’t want to become a lesser being even for one as beautiful as Apollo.
He had better luck with male lovers and is the patron of young men, teaching them music, sports and divination.
Apollo where he killed Hera’s ally the Guardian Serpent and absorbed its power. Apollo could then manifest as a snake. Apollo was
a great healer, but he was also capable of unleashing epidemics at
will. During the Trojan War, Apollo attacked the Greeks with the
plague. He can heal anyone except those he has killed himself. " SW