In Islam we believe in ONE god,one perfect god that doesn't have any sons,wive or daughters and that Muhammed (PBUH) is the last and final messenger.
This is also stated in 'shahaddat' when one is becoming a muslim,'There is no god except allah and muhammed (PBUH) is his messenger'
sorry mann ,I can't say anything about chrsitianity or Judaism cause I basically know nothing about them.
All three religions are,the three abrahamic religion,all their origins are from prophet Ibrahim or abraham with his 2 sons,isaac-judaism and christianity and ishmael-Islam? lr maybe the other way around
the prophet of judaism is moses,of christianity-jesus and islam Muhammed (peace be upon them all)
Christians believe thate jesus is god,and that there are like 3 gods making up one-jesus,teh holy spirit and god i think.