As a profanation of Christian symbolism, Satan worship is a Christian heresy, not a Pagan religion. No, Pagans do not proselytize. Most modern Pagan traditions do welcome newcomers. Most modern Pagans also do not discourage other Pagans from integrating other religious and spiritual practices and beliefs into their practice. There are a number of beliefs held by the vast majority of modern Pagans.
Divinity is seen as immanent.
Divinity is as likely to manifest itself in female as male form, the God or the Goddess, in the interconnectedness of all life. Multiple paths to the divine exist, as symbolized by many goddesses and gods. These are often seen as archetypes or gateways to the unconscious. We respect and love Mother Earth as a living being, Gaia, of which we are a part. The physical world, as an emanation of the divine, is good and to be enjoyed by all living beings in love and harmony.