I found the following verse in Padma Purana, Uttara-Khanda in Karttika Mahatmya wherein Lord Krishna speaks to Satyabhama:
saivah sauras ca ganesa vaishnavah sakti-pujakah |
mam eva prapnuvantiha varshambhah sagaram yatha ||
eko'ham pancadha jatah kridayan namabhih kila |
deva-datto yatha kascit putrady-ahvana-namabhih ||
As the rainwater goes to the ocean, the followers of Siva, the Sun, Ganesa, Visnu, so also the worshippers of Sakti come to me only. I am one, born in five ways, and play with names—as one Devadatta calls his sons etc. with (various) names. [6.88.43-44]
How do Vaishnavas interpret this verse which seems to support the system of worship of five deities?