Dear Qadiyani,
Preamble:
Our success and the success of whole mankind is dependent upon obeying the commandments of Allah (SWT) as shown by Prophet Muhammad Ibn Abdullah (Sallallaho Alaihe Wassallam) who lived and passed away in Madina 1400 years ago.
Your illusions and misunderstandings will be addressed systematically in a point by point manner so I suggest that you also get organised and address issues systematically.
Part 1: Prophets are Chosen by Allah (SWT):
We (Muslims) Believe that Prophets are chosen by Allah (SWT) and they deliver the message as they are commanded by Allah (SWT) without deviation and amendment.
There are many examples of the Prophets (AS) saying it to their people and clarifying the matter so I will give you a few.
Sayyidina Huda (AS) told his people very clearly that he was appointed towards them by Allah (SWT).
Evidence 1:


[11:1] Alif , Lam , Ra . (This is) a book the verses of which have been made firm, and elaborated by the One who is All Wise, All Aware.
[11:2] (directing the Prophet to say to the people,) .You must not worship anyone other than Allah; I am for you a warner from Him, and a bearer of glad tidings;
Prophet Muhammad Ibn Abdullah (Sallallaho Alaihe Wassallam) was explicitly commanded by Allah (SWT) to deliver the message AS-IS.
Evidence 2:

[5:67] O Messenger, convey all that has been sent down to you from your Lord. If you do not, then you shall not have conveyed His message (at all). Allah shall protect you from the people. Surely, Allah does not lead the disbelieving people to the right path.
Prophet Muhammad Ibn Abdullah (Sallallaho Alaihe Wassallam) also explicitly states that he doesn’t speak from his desires but what is revealed to him (Sallallaho Alaihe Wassallam).
Evidence 3:


[53:3] He does not speak out of (his own) desire.
[53:4] It is but revelation revealed (to him).
Summary of Part 1:
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Prophets (AS) are chosen by Allah (SWT)
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They deliver the message which is revealed to them by Allah (SWT)
If you DISAGREE please state your evidence.
If you AGREE (so far) please state clearly that you AGREE.
I will continue the discussion based on your response.
Thanks