Agreed.
That above statement doesn't even make sense. It's not true worship of the one true God if the one claiming to worship Him actually rejects Him in rejecting His only begotten Son (Who is God).
A person cannot worship God if they actually reject Him.
And it seems you have failed to understand my point. So, lets go back to what I originally said, which is that Allah (who has no son) is not the God of the Bible, the God Christians worship, the one true God. The God of the Bible has a Son, Jesus Christ, Who is Himself God; the Islamic god (Allah) does not.
Perhaps this will help clarify what I am saying:
18 Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
19 They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
20 But ye have an unction from the Holy One, and ye know all things.
21 I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.
22 Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
23 Whosoever denieth the Son, the same hath not the Father: he that acknowledgeth the Son hath the Father also. - 1 John 2:18-23
4 Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
2 Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
3 And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.- 1 John 4:1-3
God's word is abundantly clear, if a person denies the Son, they also deny the Father. It is false to claim that a person can truly worship God and yet deny Jesus Christ. Perhaps you fail to understand just how serious it is to deny Jesus Christ our Saviour.
It's very troubling that you would equate denying Christ Jesus our Saviour, God incarnate, the only hope of salvation, with getting some detail about your friend wrong.
Not even close to the same thing. As I said, perhaps you fail to understand that Scripture is clear, denying Jesus Christ is denying God.
Again, you must remember what Scripture tells us about denying Jesus Christ. You make it sound like the denial of Jesus Christ as God and Saviour, (the only hope of salvation) is not that big of a deal. Scripture couldn't be more clear on how false that is.
A denial of Jesus Christ is a denial of God.