"The greatest principle of Sufism is: ‘Ishq Allah Mabud Allah’. (God is love, lover, and beloved). [literally: God is Love, God is Beloved]
When Ahad, the only Being, became conscious of his Wahdat, only existence, through His own consciousness, then His predisposition of love made Him project Himself to establish His dual aspect, that He might be able to love someone. This made God the lover, and manifestation the beloved; the next inversion makes manifestation the lover, and God the beloved. This force of love has been working through several evolutions and involutions, which end in man who is the ultimate aim of God. The dual aspect of God is significant in Zat and Sifat, in spirit and matter, and in the mineral, vegetable, animal, and human kingdoms, wherein the two sexes, male and female, are clearly represented. The dual aspect of God is symbolized by each form of this wonderful world. This whole universe, internally and externally, is governed by the force of love, which is sometimes the cause and sometimes the effect. The producer and the product are one, and that One is nothing but love.
A church, a temple or a Kaba stone,
Quran or Bible or a martyr’s bone,
All these and more my heart can tolerate,
Since my religion now is Love alone.
Abul Ala al-Maari
Sufis take the course of love and devotion to accomplish their highest aim, because it is love which has brought man from the world of unity to the world of variety, and the same force can take him back again to the world of unity from that of variety.
Love is the reduction of the universe to the single being,
and the expansion of a single being, even to God
Balzac
Love is that state of mind in which the consciousness of the lover is merged in that of the object of his love; it produces in the lover all the attributes of humanity, such as resignation, renunciation, humility, kindness, contentment, patience, virtue, calmness, gentleness, charity, faithfulness, bravery, by which the devotee becomes harmonized with the Absolute. As one of God’s beloved, a path is opened for his heavenly journey: at the end he arrives at oneness with God, and his whole individuality is dissolved in the ocean of eternal bliss where even the conception of God and man disappears.
Although love is a sweet madness,
Yet all infirmities it heals.
Saints and sages have passed through it,
Love both to God and man appeals."
wahiduddin.net/mv2/V/V_1.htm
I think that Sufism, Buddhism, Jainism, believe in what they call GOD (existence, universal consciousness) and this is considered good by many atheists, deists and humanists unlike Christianity, Islam and Judaism who believe in a personal god and specific dogmas.
“If scientific analysis were conclusively to demonstrate certain claims in Buddhism to be false, then we must accept the findings of science and abandon those claims.”
― Dalai Lama