Everyone is sinful regardless of religion. Catholics are no different from Baptists, Anglicans or Methodists in this.
The percentage of Catholic clergy that molests children is the same as the percentage of clergy in any other religion. This was established by the recent Royal Commission into Institutionalised Child Sexual Abuse in Australia. The problem for the Catholics was not that a small percentage of the clergy was molesting children but that the church covered it up and did not remove the priests from contact with children. Consequently, many of the paedophiles had hundreds of victims.
Half the 2.2 billion Christians in the world are Catholics so they have half the clergy. This means that while the percentage of child abusing clergy is the same, there are far more of them because there are more priests. Even so, the majority of child abusers are not priests, teachers, boy scout leaders etc but fathers, grandfathers, uncles, brothers and close family friends. Families are even better at covering up abuse than the churches.
Catholicism was the only Christian religion in western Europe from the development of Christianity to the reformation in the 16th century. If it wasn't for the Catholics, there would be no other Christian denominations apart from the Orthodox and the Coptics.