The "God Supreme" of the religions that sprung from India and of the other world religions - "is none but one"
In India the "God Supreme" was given many different 'forms' and 'names' by various "Hindu Religious Beliefs" - as God Siva (Shiva) in Saivaism, as God Vishnu in Vaishnavaism, Goddess Sakthi in Saktham, God Kanapathi in Kanapathiyam, God Skanda in Kaumaram, and as God Agni in Vedism - (collectively known as "Hinduism") - and was worshiped by Hindus from the time immemorial.
The above God Forms never took birth in this world in human forms. Hence they were called by the prefix title (the) "God"
However in Vaishnavaism it was further considered that God Vishnu took ten incarnations in this world, among which are the incarnations as Lord Rama and Lord Krishna.
The Jainism and Buddhism preached by Lord Mahaveer and Lord Buddha - being two other religions of India, upheld the principle of non-existance of God. Sikism recognised "God Supreme" as the Guru (Preacher) to the mankind.
Among the world religions - the Islamic religion referred to the "God Supreme" of no specific form or name as "Allah", and Prophet Mohammad as the Messenger of the "God Supreme".
The Christian religion referred to Lord Jesus Christ as the Son of the "God Supreme" of no specific form or name. Judaism too recognised the existance of the "God Supreme" of no specific form or name.
Hence it should be understood that - "no Religion in this World is superior to the other" - as all these Religions worship finally to the 'One and only' Ultimate - the "God Supreme"