Let me be the first on CAF to welcome you home friend ^^ I was also away from the Church for a while, and felt that same urge and calling that you did. It is a wonderful experience, isn’t it, to tangibly feel God calling out to you… ^^
Now then, on to your question.
As for pointing out “errors” in the Bible, I 'll say this bluntly and with absolutely no hesitation. There are zero errors in the Bible. Absolutely none whatsoever. Any perceived error is derived from a faulty understanding of context, historical time / position / writing styles / etc. We will gladly address any perceived errors if you have some specific ones that are bothering you. There are some great, and incredibly knowledgeable people on these forums; I’ve yet to have a question left unanswered.
As for the Gospel writers not knowing Jesus, I would ask them to present their evidence to that affect. There is actually quite a bit of evidence the John, at the very least, was one of Christ’s disciples, and traveled with Him during his ministry. John, at several points throughout his Gospel, gives accounts which could only have come from first hand experience, and makes several reference to “the disciple” which historians have concluded likely point back to the writer himself. (as a note, I’m pretty sure this is John, but I may be confusing it with Luke… sorry…)
As for the allegation of “changes” to the Bible… If by “changes” they mean minor modifications to translations as a greater understanding of the Greek and Hebrew languages are developed, then sure, there have been “changes.” None of those changes, however, affect the nature of the Book, or what is said, simply the most appropriate word selection for translation into a given language. (Greek doesn’t really translate all that well to English

) If by changes, however, they mean changes in the meaning and overall history presented by the Bible, then they are absolutely mistaken, and I would once again ask them to present their evidence to that affect. I’d lay odd that they will be unable to do so. The first person to make any real and substantial changes to the Bible was Martin Luther, when he removed the books that disagreed with his personal, flawed interpretation of the Faith / Bible (Maccabees, for example, and its clear assertion that you should pray for the souls of the dead, indicating the existence of purgatory, which was a doctrine of the Church that Martin Luther flat out rejected)
It is also important to note when considering their claims, that the Bible as it is commonly understood today was not compiled until the early 300’s, and that it was compiled by the Catholic Church. This is a matter of historical fact.
Sorry if this has been a little long winded. The path to understanding the history of Church, and being able to defend it, is a long one, but one that many people here have embraced with great joy. The Church’s history is deep, and rich, and every belief is well founded in both scripture and history. You are at the start of a great journey to understand your faith, and should relish the great breadth of the centuries of dedicated study that have come before you.
If you have the resources, or if a family member is looking for a Christmas gift for you, I would highly, highly recommend the
St. Ignatius Catholic Study Bible It is split into two books, one for the Old Testament and one for the New. I personally would start with the New. I received it last year for Christmas, and have learned so much from it. Each page is broken into two parts, one is the Bible readings, and the other is a scholarly description / explanation of various passages of scripture which are hard to understand without proper context / historical knowledge. In addition to this, it goes into great detail about the the origin of each Book, who the understood author is, the historical context and desired target of their writing, and a myriad of other details. In particular, it can address your concerns about authorship and the author’s relationship to Jesus and the Apostles. I cannot recommend it enough, and have learned more about my Faith from it than I can put into words.
God Bless you friend, I wish you great success in your journey, and urge you to stick around. I have learned a great deal from the people on these forums, and know that the same will be true for you should you chose to utilize them.