> But didn’t Christ find one Church?
Yes he did and the pagan idolatry of the dying Roman Empire corrupted it. Nevertheless it was allowed to flourish until such a time that humanity was ready to throw off those pagan trappings and start rediscovering Christ and true worship without a pantheon of intermediaries.
Well, then Christ couldn't live up to his promises and the Church was led into error, right?
Mat 16:18 And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it.
John 14:26 But the Paraclete, the Holy Ghost, whom the Father will send in my name, he will teach you all things and bring all things to your mind, whatsoever I shall have said to you.
Mat 28:20 behold I am with you all days, even to the consummation of the world.
According to your theory there was a time when Jesus left his Church and it became corrupted. I can't accept that.