1. My mistake, it was the two-horned one. Should have googled it first. Mohammed was telling the story.
http://quran.com/search?q=sun+waterApparently there are a number of efforts to reinterpret this passage. Your meeting-place version is new to me.
Sahih Intl (with context):
Indeed We established him upon the earth, and We gave him to everything a way.
So he followed a way
Until, when he reached the setting of the sun, he found it [as if] setting in a spring of dark mud, and he found near it a people. Allah said, "O Dhul-Qarnayn, either you punish [them] or else adopt among them [a way of] goodness."
Muhsin Khan:
Until, when he reached the setting place of the sun, he found it setting in a spring of black muddy (or hot) water. And he found near it a people. We (Allah) said (by inspiration): "O Dhul-Qarnain! Either you punish them, or treat them with kindness."
Pickthall:
Till, when he reached the setting-place of the sun, he found it setting in a muddy spring, and found a people thereabout. We said: O Dhu'l-Qarneyn! Either punish or show them kindness.
Yusuf Ali:
Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: "O Zul-qarnain! (thou hast authority,) either to punish them, or to treat them with kindness."
If you meet at sunset, and report that the sun went down, that makes sense. If you meet at sunset and report that you found it in a pool of mud or water surrounded by people, that is a little bit more difficult to understand. Perhaps the "report" was figurative?
The Bible's got a few tricky ones too, I'll admit, virgin birth, healings, resurrection, and all. They're all unlikely bad science as far as a godless world is concerned.
The important thing I want to convey is that Jesus' message throughout the gospels is NOT the message that Islam says it is, and his glorification is not polytheism as the Quran insists. His claims to be the son of God (yet one with God) were consistent throughout the gospels. If there's anything in the Islam that I would have you question, that is it. You'd have to discard more than half of what he said, in statements echoed through many writers in the early church.