$1:
It's easy to tell who are Sikhs Gunnair, they have beards. Non Sikhs in both the British and British Indian Army were forbidden to have beards.

Not true. Bengal Native Infantry.
$1:
Obviously there were Muslim soldiers in the BIA but there were problems with 'Sepoy' type head dress and their similarity to Sikh turbans. The Ceremonial uniform headdress of the modern Pak Army may resemble a turban to the casual observer but the military minded with Imperial experience can tell easily tell the difference.
A bit of semantics since we're not talking about the modern Pakistani Army. Muslims in BIA regiments wore turban style headress. If you take umbruge with it being called a
turban vice a
lungee or
sepoy style headress then we'll call it a
sepoy style headress with a resemblance to a turban.
$1:
Your first picture was of Sikhs, your second picture looks like Sepoy headress of the late 19th century but it's a bit small to tell.
Yes to both.
$1:
And if you have studied the BIA at all you will know that the core or the BIA were the Sikh and Ghurka regiments. They were the teeth arms of the BIA. If you check the modern Indian Army you will see that many of it's Regiments are Sikh as are a good chunk of its General Staff and Field Officers.
I have read a book or two.
The backbone of the army came from the predominantly muslim regiments of the Punjab. and not the Sikhs and Ghurkas as you suggest. From 1862 to 1914 Muslim regiments from the Punjab grew from 28 to 57. Add to their numbers the Pathans, Dogra, and Baluchis and I submit it ain't as simple as you suggest. Though there may have been more Sikhs, they had their own issues that made them tempermental. Muslims were seen as great warriors and very loyal to the Sirkar.
$1:
Winston Churchill and Mountbatten each had less than favourable things to say about this portion of the segregated BIA.
O
Such as?
$1:
On the propensity of the very large Muslmim population in the UK to cause shit, you have gone quiet.
Well since you are simply offering a subjective opinion on the subject, what is there to say?