Does Ripple require users to input their ID and personal data? Currently all the USD to crypto currency exchanges require personal identification before withdrawing to USD. Does Ripple require this? How about the Ripple Gateways that do the currency conversions?
Ripple has no such requirements, nor could it. It is designed to function without any central authorities. A Ripple account is created just by sending a small amount of XRP to it. The account's owner authenticates using a public/private key pair.

In principle, you could get USD into or out of Ripple without going through a gateway directly. You can meet someone in person anonymously, hand them a $50 bill, and they could give you a $50 Ripple balance. In reverse, you could sell a Ripple balance in person anonymously for cash. But in practice, to get money into and out of Ripple, you'll typically use a gateway's issue and redeem functions, and they will have identity policies.

Gateways can also require you to provide them identification just to hold balances from them on Ripple. To my knowledge, no gateway currently does this.