2 Timothy 3:16 (KJV)

All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:

Though Thanksgiving itself isn't pagan one of the main symbols of Thanksgiving is. So if you choose to celebrate this day, just be careful not to incorporate this pagan symbol in your holiday... the Cornucopia. 

The Cornucopia is also known as "the horn of plenty" and has it's roots in both Greek and Roman mythology. There are two myths about the cornucopia in Greek Mythology on how this horn came about. The first one is that as a child, Zeus was nursed by the nymph Amalthea. One day, while playing, Zeus accidentally broke off one of Amalthea's horns. The horn then magically began to provide an endless supply of food and drink.The second is  the myth that Hercules fought the river god Achelous, who could take the form of a bull. Hercules broke off one of Achelous's horns, which then became the cornucopia. Both stories use the Cornucopia to symbolize abundance and nourishment. 

In Roman paganism the Cornucopia is usually seen being held by the goddess Fortuna which is the goddess of luck, fortune and fate. The Roman goddess Ceres, the goddess of harvest and aggriculture, is also often associated with the Cornucopia. 

The cornucopia has a rich history that spans ancient mythology, Roman culture, and modern-day traditions. Originally a symbol of divine abundance, it has evolved to become a symbol of prosperity and the harvest, particularly associated with the Thanksgiving holiday. So if you want to avoid paganism on Thanksgiving, skip the Cornucopia. 

God himself has his own Fall Harvest Feast called the Feast of Tabernacles. So if you wanna skip Thanksgiving altogether and just celebrate God's biblical feast we understand, that's how we do it.