The Vatican has declared the Society of St Pius X (SSPX) to be formally in ‘schism’ with the Catholic Church after the traditionalist group defied Pope Leo XIV by consecrating four bishops without papal approval.A schism is a formal break in the unity of the Catholic Church. It occurs when a person or group rejects the authority of the pope, whom Catholics believe is the successor to St Peter, one of Jesus’ 12 apostles.Recommended Stories list of 1 itemend of listIn a decree issued on Thursday, the Vatican’s doctrinal office said the bishops involved, along with priests and lay members who knowingly adhere to the breakaway movement, had been excommunicated and no longer allowed to be members of the Church. It warned that the Swiss-based group’s celebration of the sacraments is now considered illicit and that it may no longer officiate marriages or hear confessions.The non-approved consecrations mark the latest flashpoint in a decades-long dispute between the Vatican and the SSPX, which broke with Rome after rejecting many of the Catholic Church’s modernising reforms introduced by the Second Vatican Council.Here is what we know:What has happened and what is a consecration?On Wednesday, the traditionalist Catholic group SSPX directly defied Pope Leo XIV by consecrating four new bishops without his papal consent.In the Catholic Church, the act of consecrating a bishop is a deeply symbolic religious ritual which confers the Holy Spirit from one bi …