Temples for Brahma, the Creator are few.
Mythological reason is that Brahma lied about finding the feet of Lord Shiva in the form of Linga and was cursed to this effect by Ishwara
.
Philosophically speaking, Brahma is not worshiped because He is the Creator, the cause of Birth.
Hinduism attributes the cause of suffering and endless cycle of Life and Death to Birth.
