I believe in the power of Satan as it pertains to individuals that become disobedient to the vision of heaven. I do not Strengthen Satan because I possess self-control. Satan easily tempts and gains strength from individuals that lack self-control. Therefore, your question pertaining to agree or disagree cannot be answered through belief alone.
Belief in Satan by itself does not Strengthen Satan. Satan himself masks himself as an angel of light within the darkness so that he can entice the weak. This leads to lawlessness in accordance with how Satan works his temptations on the distressed. Satan uses a display of evil power through signs and wonders that serve to sway the weak individual.
The social welfare agenda currently on display in many nations of the globe provide Satan with a squeamish theatrical occult where distressed individuals are easily bound due to weak self-control. This evil cannot remain hidden forever because it is seen as opposition to good deeds that are obvious to all mankind.
The official website of the Church of Satan states: "we are the first above-ground organization in history openly dedicated to the acceptance of Man’s true nature—that of a carnal beast, living in a cosmos that is indifferent to our existence. To us, Satan is the symbol that best suits the nature of we who are carnal by birth—people who feel no battles raging between our thoughts and feelings, we who do not embrace the concept of a soul imprisoned in a body. He represents pride, liberty, and individualism—qualities often defined as Evil by those who worship external deities, who feel there is a war between their minds and emotions..Man—using his brain—invented all the Gods, doing so because many of our species cannot accept or control their personal egos, feeling compelled to conjure up one or a multiplicity of characters who can act without hindrance or guilt upon whims and desires. All Gods are thus externalized forms, magnified projections of the true nature of their creators, personifying aspects of the universe or personal temperaments which many of their followers find to be troubling. Worshipping any God is thus worshipping by proxy those who invented that God. Since the Satanist understands that all Gods are fiction, instead of bending a knee in worship to....such mythical entities, he places himself at the center of his own subjective universe as his own highest value."
Therefore, I believe Satan is the only power that can Strengthen Satan.