The bible says that all other gods are lifeless idols. Psalm 96.
Was it a surprise that Dagon fell before the ark of the covenant?
No, it just shows you the superiority in the power of our God. The bible calls Him ElShaddai meaning all-powerful.
Choose today who you serve,
Jos 24:15 KJV And if it seems evil unto you to serve the LORD, choose you this day whom ye will serve; whether the gods which your fathers served that were on the other side of the flood or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the LORD.