The ‘doctrine of Monotheism’ has been very precisely and concisely enunciated in the Koran but the Bible is not far behind. According to the Old Testament, ‘It is I who made the earth, and created man upon it.’ (Isa. 45:12) And again, ‘Do we not all have one Father? Has not one God created us?’ (Mal. 2:10).
The Doctrine of Trinity is not mentioned even in the New Testament. According to Encyclopaedia Britannica reads: ‘Neither the word Trinity nor the explicit doctrine appears in the New Testament.’ There are scores of verses that can be presented from the Bible that Jesus Christ believed and preached monotheism.
Therefore, I can safely say, prophets throughout the Abrahamic religions including Jesus and Muhammad and Promised Messiah Ahmad have strongly preached monotheism.
This is what I accurately mentioned in my letter. I think, we all should read Holy Scripts carefully rather than only the concepts of others.