I do believe Continental Drift. My reasons for this is because there once was Pangaea --- which is all the continents connect as one --- and because of this, there was a freshwater animal. This animal lived in South America and Africa. if you look at map of Pangaea you will see these are connected, but today they are separated by salt water. Now, my question to you is, how could a fresh water animal live on two continents that are currently separated by salt water???
I honestly cannot tell you if i believe in Seafloor Spreading and Plate Tectonics. Why? Because I honestly don´t know myself.