Apparently what you have read was written by haters of the Catholic Church. There are many of them. History plainly shows that the Catholic Church is the only church with a clear historical presence in every century back to the 1st Century, and that it was the only Christian Church on Earth for the first 1,000+ years of Christianity. Therefore it is the one Church founded by Jesus Christ, the Church to which He promised, "The Holy Spirit will guide you into all truth", and "Whatsoever you bind upon Earth is bound in Heaven", and "He who hears you hears Me". You say you are searching for true Christianity, but it sounds like you are too confused to make a real choice, as demonstrated by your reference to Unitarianism, which is about as close as you can get to having no beliefs at all.