[Ali Imran]

Where in the Quran did Allah ask Muhammad to check with Salaam?

It's not false for Muhammad to consult previous scriptures. Since he was illiterate, he would need to rely on others who could read the texts to verify them....that's simply common sense, isn't it?

So you cannot say it is a lie...you can simply say that the message is not clear

You said Allah instructs our prophet صلي الله عليه وسلم to check with the previous scriptures. That is a lie.

Allah tells our prophet صلي الله عليه وسلم to check with the people who knew about the prophecy of his prophethood. An example of such person is Abdullah bin Salam.

Christians like you will want to twist it and make it look like their scriptures have some legitimacy with us.