Christians and Muslims absolutely do not worship the same God, the Christian God absolutely has a Son...
Who has gone up to heaven and come down?
Whose hands have gathered up the wind?
Who has wrapped up the waters in a cloak?
Who has established all the ends of the earth?
What is his name, and what is the name of his son?
Surely you know!
In the same way, Christ did not take on himself the glory of becoming a high priest. But God said to him, “You are my Son; today I have become your Father.”
Yet the Muslims supported by the Qur’an have written all around the rim of the Dome of the Rock... “god has no son... god has no son...”
Additionally the Son of God mentioned in the Bible died for my sins, according to the Scriptures...
1 Corinthians 15:3-4
3 - For I delivered to you as of first importance what I also received, that Christ died for our sins according to the Scriptures,
4 - and that He was buried, and that He was raised on the third day according to the Scriptures,
This not only vindicates the prophets but is fundamental to Christianity and our salvation, but the Quran states...
Making a mockery of both the prophets, and Christ’s Words... in fact Paul says that if Christ who was crucified, was not then raised from the dead according to the Scriptures, then we who believe on Him and the prophets... are most to be pitied, wasting the little life we have on a lie!
1 Corinthians 15:14-19
14 - and if Christ has not been raised, then our preaching is vain, your faith also is vain.
15 - Moreover we are even found to be false witnesses of God, because we testified against God that He raised Christ, whom He did not raise, if in fact the dead are not raised.
16 - For if the dead are not raised, not even Christ has been raised;
17 - and if Christ has not been raised, your faith is worthless; you are still in your sins.
18 - Then those also who have fallen asleep in Christ have perished.
19 - If we have hoped in Christ in this life only, we are of all men most to be pitied.
This so called ‘professor’ has fallen for - “another Jesus preaching another Gospel empowered by another spirit” - even the Jesus of the Quran who was not by definition the Son of the very God, but rather impersonating a lie empowered by the spirit of antichrist who shall come...
2 Corinthians 11:4
For if one [A muslim] comes and preaches...
 - another Jesus whom we have not preached,
 - or you receive a different spirit which you have not received,
 - or a different gospel which you have not accepted, you bear this beautifully.
Jesus warned us that there would be others who would say “I am He”, who shall mislead many such as this ‘professor of confusion’...
Many will come in My name, saying, ‘I am He!’ and will mislead many.
...looks like they caught her hook, line and sinker.