Regarding Christianity v. Islam.
First, consider the principle that extraordinary claims require extraordinary evidence, frequently quoted (but generally misapplied) by atheists.
Jesus used this principle himself:
John 14
11 Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the works themselves.
The earliest Christian documents have Jesus performing miracles.
However, the earliest Muslim documents clearly say that Muhammed did not perform miracles, even when he was challenged to do so to support his claims.
While I can't conclusively prove that Jesus provided extraordinary evidence, there is some evidence of it. The Quran admits that Muhammed didn't provide such evidence.
That's the first differentiator between Christianity and Islam.
First, consider the principle that extraordinary claims require extraordinary evidence, frequently quoted (but generally misapplied) by atheists.
Jesus used this principle himself:
John 14
11 Believe me when I say that I am in the Father and the Father is in me; or at least believe on the evidence of the works themselves.
The earliest Christian documents have Jesus performing miracles.
However, the earliest Muslim documents clearly say that Muhammed did not perform miracles, even when he was challenged to do so to support his claims.
While I can't conclusively prove that Jesus provided extraordinary evidence, there is some evidence of it. The Quran admits that Muhammed didn't provide such evidence.
That's the first differentiator between Christianity and Islam.

