We Make No Distinction Between Messengers

S 2:136 Say: We have believed in Allah and what has been sent down to us and what was sent down to Ibrahim and Isma’il and Ishaq and Ya’qub and the tribes and what was given to Musa and Isa and what was given to the prophets from their lord. We do not distinguish between any of them. And we are Muslims to him.

What exactly was that 'sent down to us, to Ibrahim,' etc., respectively? "...and what was given to the prophets..." Were none of these characters prophets?

S 2:285 The messenger has believed in what has been sent down to him from his lord, and the believers. All have believed in Allah and his angels and his books and his messengers. We do not distinguish between any of his messengers. And they have said: We have heard and obeyed. Your forgiveness, our lord, and to you is the destiny.

"...and the believers. ..."? Was the Founder of Islam a Believer? "WE do not distinguish between any of HIS messengers"?

S 3:84 Say: We have believed in Allah and what was sent down upon us and what was sent down upon Ibrahim and Isma’il and Ishaq and Ya’qub and the tribes and what was given to Musa and Isa and the prophets from their lord. We do not distinguish between any of them and we are Muslims to him.

Again, what was 'sent down to XY and Z'? "...and the prophets..." Were none of these characters prophets?

S 4:150 Those who disbelieve in Allah and his messengers and want to differentiate between Allah and his messengers and they say: We believe in some and disbelieve in others. And they want to take a way between that.

Should no distinction be made between Allah and its messengers? If the Bible is corrupted, how will they know whom to believe in?

S 4:152 And those who have believed in Allah and his messengers and have not differentiated between any of them, those--he will give them their wages. And Allah was a forgiver, merciful.

Don't Muslims make a distinction between the founder of Islam, supposedly a messenger, and others deemed messengers? For example, whose assumed name appears in the Shahadah? If Jesus, supposedly an Islamic messenger, is blasphemed, do Muslims get upset and riot? Do they get upset if the founder of Islam, supposedly a messenger, is reviled and do they riot over him?

Now, even Allah makes distinctions between him and others. Messengers are spoken to by Allah and miracles are seen at one or two messengers' hands. But 'Muhammad'...