Why Do Catholics Exclude Others from Receiving Communion?

Only Catholics are able to receive Communion at Mass because the Eucharist is the Sacrament of our unity in Christ; those who receive it need to have unity in the Faith. Those who reject Catholicism including Protestants and non-Christians, reject the doctrine of Transubstantiation. We Catholics believe that Jesus does a miracle in every Mass and turns our offerings of simple bread and wine into His Own precious Body and Blood, but others do not believe this. The Catholic Church isn’t doing something mean or intolerant.