Not enough of them anyway. You have to use at least five bowlers in Twenty20. India have been using Harbhajan Singh (great); Zaheer Khan (really good, but occasionally vulnerable in Twenty20); and Ashish Nehra (solid but unspectacular).
To make up their remaining overs, they use Yusuf Pathan, who is clearly picked for his batting with his bowling being considered ‘acceptable’; Ravindra Jadeja, who is no way one of India’s best spinners and is therefore being picked on the basis of what he can provide at eight or nine in the batting order; Suresh Raina (batsman); and Yuvraj Singh (batsman).
It seems the team is all about batting, which is something you always suspect about India. Pragyan Ojha, Amit Mishra and Piyush Chawla are all bowlers who would be worth a place in just about any Twenty20 side, but they don’t get picked. The attitude seems to be that the game is about batting and the whole philosophy revolves around that.