When the believers go to the temple and be a part of the temple feast, is he not partaking of the worship? He may not think anything of the idol but the fact that this sacrifice is brought to devils. Be aware of the spiritual implication of such actions. Demonic power culminates in Satan worship. Satan is the evil one, the prince of this world.
We know that Satan possess great powers to torment mankind. Job suffered under the onslaught of Satan. God protected him. Mary Magdalene was possessed with seven devils before she was glorious saved by Jesus. The demons departed out of her, never to bother her again when she received Jesus Christ, the Son of God, in her heart. She was the first to be at the tomb of Jesus on resurrection day. She was the first to see the resurrected Christ. She loved her Lord. Jesus comforted her.