What is the Church? The Church is the congregation of all baptized persons united in the same true faith, the same sacrifice, and the same sacraments, under the authority of the Sovereign Pontiff and the bishops in communion with him.
The kingdom of heaven is like a man who sowed good seed in his field. (Matthew 13:24)
Who founded the Church? Jesus Christ founded the Church.
And I say to thee, thou art Peter, and upon this rock I will build my Church, and the gates of hell shall not prevail against it. (Matthew 16:18)
Further reading: CCC 748-750