The first Christians were Jews practicing Judaism while practicing the altruistic lifestyle Jesus' preached about.
In addition -
14. There were no books used to interpret scripture.
15. There were no extra-scriptural books or magazines.
16. There was no Bible. Just the Torah and some letters written (Mostly by Paul).
17. There were no requirements to become baptized.
18. There was no obsession with being different.
19. There was no obsession with man-made rules and regulations (exception: Paul did this).
20. The practice of Apostolic Succession (exception: Paul. Paul pulled a Rutherford and declared himself an Apostle).
21. Christians were required to sell all personal property and donate the proceeds to the church (communal living).
22. Those who travelled to visit the various churches were self-employed instead of living off donations and "green-handshakes".