Hindu ?
No. Almost all the scriptures and traditional prayers are in Sanskrit. So if you want to go to the source, you need to know Sanskrit. But to follow the religion, you need not know Sanskrit. There are good translations of almost all the major texts in several other languages, from which you can derive benefit. What is important is to understand and follow the principles. But, if you want to understand and appreciate Indian culture, a knowledge of Sanskrit and other Indian languages is necessary. Much of the culture is embedded in the word formations and connotations. Also, you cannot have a direct first-hand experience of the Indian culture without the knowledge of the language in which the culture is implemented.
