[Avodah] hayom yom rishon....

[Harvey Benton]

i was told that the reason we are allowed to use the babylonian names of our months (although) they (10 of 12)
were names of babylonian gods, is that we are allowed to use the names of gods/months, that appear in  the
gemmara?? 
1 is this  true; 2. would this reasoning (at all?) apply to our using the names we currently use
for our weekdays (eg, sunday= Sun [god], Monday = [Moon (god)] day. etc, 
.....other names of our weekdays i have read (not verified) are from mercury and other gods that are 
(or were) once worshiped. 
isn't there a biblical commandment to not allow the names of foreign gods on our  lips??
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