I found a very useful utility online for drawing diagrams (no program installation is required) called draw.io :
I made the following simple diagram quickly and easily, based on my view of the foundations of Christianity :
I also created this diagram of the dating relationships of the early Christian history and writings, based on Bernard Muller's work :
Bernard Muller's original work can be found here :
Here is a diagram showing the dates of various early Christians and their sources :
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