I think you have raised some valid points. However you must remember that Jesus said, "But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you" (John 14:26, New International Version, 2011). And I could not agree more that if people are looking for sign to have faith in Jesus, they are in danger of being deceived by false prophets. Does this mean, however, that if the Holy Spirit does work through believers, believers should say ". . . It is not from God, but the Devil"? Notice in my article, located in the second to last and last line of the final paragraph, I state, "These differing views [Cessationism & Continuationism] have left me with many more questions than answers, but I have concluded regardless of which view you support, in the end, spiritual gifts are only secondary; what is most important is that we have God's love."
Also, what is the point of including information regarding the Holy Spirit in the Scripture, if the Holy Spirit was only accessible to those living prior to the closing of the Canon? Or let me pose the question another way: If you believe the Holy Spirit is still on earth and working in the hearts of believers, then what purpose does it serve, that is, if it does not uplift believers in a manner that brings glory to God? Why is there even mention of the spiritual gifts in 1 Corinthians 12, if indeed those gifts do not apply to us today? Remember I ask these questions out of curiosity, because Jesus said, "If a kingdom is divided against itself, that kingdom cannot stand" (Mark 3:24). Or how can we say if spiritual gifts do bring glory and honor to God that they are not from God?
Lastly, I do not dispute the fact there are many false prophets who lure people into an apostate religion. It is unfortunate the term "Charismatic" has been high-jacked by a wave of New Age, Neo-pagan Televangelists. Shouldn't all Christians be charismatic? Of course they should be. But we should not confuse charisma with what these heretics make it out to be on television. This is just one reason I used the term Continuationist, as opposed to Charismatic, when explaining the belief in gifts of the Holy Spirit. There is such a thing as a false Christianity, and more often than not, the leaders or representatives of this false Christianity use so-called spiritual gifts to deceive people. However, there is a difference between genuine spiritual gifts that are used to glorify God and edify the Body of Christ and those which are used to glorify one's-self and take the glory away from God, by focusing on miracles rather than His [God's] Word.
Therefore, I am in agreement we should not focus on spiritual gifts, signs or wonders, to the extent we lose sight of that which is truly important; Jesus Christ. Yet we should not attempt to negate how God uses His Holy Spirit through men to carry out His [God's] will.
Grace and Peace!