lmorovan,
"No, what I am saying that what the Bible does not teach, we should not do."
Should we discuss the Bible on a internet message board?
Should we have baby showers for soon to be mother's?
Should we be able to go to a movie?
Can we eat ice cream?
Should we use a microwave to heat our food?
Not everything is morally right or morally wrong. If celebrating someone's birthday was a sin against the will of God, He would have revealed it directly or through principle, He did not.
As excel said, you are wandering into legalism and it is not a term to defend or justify sinful things.
1 Corinthians 6:12
12 All things are lawful for me, but not all things are profitable. All things are lawful for me, but I will not be mastered by anything.
The book of Galatians deals with legalism.