Now that I'm out, I can point to twice and thrice as many scriptures to refute them as they can throw at me to support them.
Birthdays are bad because murders happened at them and no where else are birthdays mentioned.
My answer: Angels and shephards celebrated the birth of Jesus. By the way, his second birthday was celebrated and gifts were given (though not very practical gifts for a two year old).
My answer: Murder tends to make the person look bad, not the setting or day of the murder.
My answer: The people involved were famous people of the Bible: Joseph read a dream by God and John the Baptist died. I would say that those two events no matter the setting were very Bible worthy to write down.
My answer: The culture/condition of Bible times was that the average person could not afford to have an elaborate party for birthdays or anything else as the Romans really were jerks that oppressed the people and there was a famine going on in Egypt. Only royals and nobles could afford such a thing.
Pagan connections to birthday parties?
My answer: Then stop wearing a white wedding dress, ring, and carrying flowers in the ceremony. Oh, and no veils!
My answer: Colosians 2:16 and Romans 14:5 and the one about busybodies meddling in other peoples' affairs.
So, you see that when someone leaves, they become better at using their Bible:)