I don't participate in Church (this can change), but I know for sure the Holy Spirit has real power. Eversince I was saved, and baptised with the Holy Spirit (without being dunked in water, although I would like to someday). I overcame many things which I couldn't do before such as.
Smoking - before I was saved, I had a hard time quitting smoking. now with the help of Holy Spirit, I just quit cold turkey for about 8 week now. and nothing can make me come back anymore for sure.
Drugs - I never say NO to drug, but now it is a "Get Away From Me"
Sex - I had sex all the time (I'm not married), now I just feel disgusted
Gambling - this one is big for me, when my blood is heating up it is usually not a good financial sign. I drive 3 hr one way to the casino every week. now, I'm saving that gas money to buy some good tasty fruits
Driving - I usually drive pretty wreckless, now I drive like an old man and judging how wreckless the other kids are driving
Cussing - Yeah, I love cussing in every other sentences. Now, I'm prevent it from even coming to my thoughts. Take a lot of self reminder but it has been working well.
Drunkard - Now, as sober as a bunny
Gluttony - OH yeah, who doesn't love food? I know I do for sure. Now, I eat just enough and try not to surpass the full line.
Many other addictions, the point is the Holy Spirit has this power to overcome many problems in your life. These changes are ALL recently.
I'm a man and I thought that I will never cry but the other day when I think about what Jesus did for me (saving my soul), I was driving and tears of joy and appreciation started to coming out uncontrollably. It felt so great, glad no one saw me crying. Another time was when I watch a music video about Jesus, the Holy Spirit kicked in and I felt so much love and joy and started crying again. IT was great. Anything that remind of me what Jesus did for everyone, how he sacrifice himself put me to tears, only with the Holy Spirit then you can feel it. I don't know how else to explain it, you just have to go through it to believe it.
Sins = punishments = death
Lets Jesus take the punishments for you now, no one is good enough to endure any punishments from God nor can they erase their sins.
Tell Jesus " Thank you for taking the punishment for me" that is why I cried, the Holy Spirits allowed me to truly felt what Jesus has done for all.
So, I believe every Christians need the Holy Spirit to fully walk their path. It work differently on everyone for sure.