Without the OT scriptures, there's no Covenant for Jesus to fulfill. Without the OT prophecies, there's no fulfillment of those prophecies in the NT. Without Abraham, there's no Isaac or Ishmael, or their descendants.
Absolutely. I've never argued that there's no reference to the past. You argue that there always must be (that I can't examine Islam without reference to previous revelations) - that any look at one must involve a reference to the other so I ask you again for any Jewish understanding on the Trinity that I must be engaged in in order to examine the Christian understanding of the Trinity.
After-all, according to you I'm not getting the full picture!
But you can't revise the original work, or supplement the original work, without the original work.
Show me the Trinitarian evidence, then.
Because the history text is accepted as a source, since others have vetted the book well before you wrote those papers for your classes.
That's what 'revision' is. However you said that I must do this. So now you have exceptions wherein I can have a discussion using an historical source without referencing all previous editions... which is in fact my objection to the continual reliance on
tu quoque in relation to Islam.
I can examine claims about Islam without any reference to Judaism or Christianity. You say I can't.
Secondly Christianity isn't a 'revision' of Judaism. Christians didn't go through the OT and say "Okay that's what Judaism believed, but now we're revising this text to mean something else".
Certainly they have gone through the OT and understood OT verses in the light of Christian understanding and certainly Christianity is a 'continuation' of Judaism, but it's not a revision of it... which is why your analogy is doubly flawed.
We can of course occasionally look back but we don't always have to do this. Islam has no bearing on the OT or the NT. They might believe so, but there is no connection. Not only did God not promise Muhammed in the NT, but his promise to Israel wasn't foresaken that he goes "Okay, I've sent a continuous line of prophets to one people, I'm giving up on them and I'm going to try another people now".
(Unless you can show me OT or NT understanding that God changed his promise). THEN I would like to see a reference back because the claim would be based on this.
Islam is not unique in this.
Hong Xiuquan also made claims that he was a continuation of the NT - he thought he was Jesus' younger brother.
Any evidence to any of these things and I'd be happy to consider it, despite it being off-topic, and novel.
Islam's claims to war against all can be judged on their own merits.