This film really isn't about Jesus Christ, at least not as depicted in the Bible. If you want a visual expression of popular uninformed myths about Jesus, this is the film for you. However, it is staggeringly inconsistent with Jesus as portrayed in the Bible.
For instance, as a prophet, John the Baptist was fully aware of the deity of Christ the second he met him. He didn't need to help him turn from a regular Joe uncertain of his future into the Son of God over a suppertime chat.
Also, the suggestion that Christ sinned is inconsistent with the entire Bible, and on theological grounds renders his sacrifice pointless, as any old person could have done it if the criteria for bearing the sins of the world didn't involve being sinless.
Ultimately, the best advice I've got if you want to know who Jesus Christ is, is to read one (or all) of the 4 eye-witness accounts of his life documented in the Bible - probably John's gospel as that's the most personal of the 4. Also, really don't bother with this. It's misleading and hugely uninformed, and very disappointing given the painstaking accuracy to the original text shown in some other entries in this series, such as the excellent, Emmy-winning Joseph, or Abraham.