Religions!!  What is the significance of Holy water....?

Nothing just a roman catholic pagan idea it actually spreads germs with people sticking dirty finger in the font

the Anglican Catholics dont have a font full of dirty water no matter what they call it

Please read my response and so that you can also have access to the link I'll mention in my response. Also, do see my comments as I post something. Do watch.

Good question, the only Holy Water that I believe in and is holy, is the water Zam Zam and its miraculous properties. How its name came to be is very special as well. The way the water Zam Zam behaves is very fascinating and quite different than regular water and it is very pure. It is the purest kind of water, it has a unique pure taste, its thicker than any other regular water. When someone adds Zam Zam water into regular water, that water will be completely consumed with Zam Zam water and no longer regular water. The miracles of Zam Zam water are great and it has a beautiful story about how Zam Zam water came to be. If you'd like to know, I am more than happy to tell you the short story in the comments.

I hope to post a helpful link in the comments later to show you that and please do watch once I post in the comments.You will be fascinated with the scientist who has done the scientific tests on Zam Zam water and he believes the water to be miraculous and very special.

Those who believe and who drink the water Zam Zam, will benefit them only and that water will be for them whatever they wanted it to be for them. Some people use it for healing, for good health or to heal them in some way and to benefit from the benefits of Zam Zam water.

Some drink the water as nourishment when there is hunger or when someone has no access to food and drinks the miraculous water to satisfy his hunger and they will still be perfectly healthy their bodies will still show signs of good health.

Someone who is facing hunger or famine, and who lives on Zam Zam water for nourishment or for food, will still be healthy and their body will not deteriorate due to the famine because a person who drinks Zam Zam for nourishment will not experience the consequences or the disadvantages due to famine and will still appear healthy as well as they are on the inside.   

These are one of the significant reasons about the holy water Zam Zam and one of the amazing benefits of Zam Zam water. It is a living, miraculous, pure water from God and Zam Zam water will be whatever the person wants it to be as for personal benefit.

Furthermore, when people are making the pilgrimage hajj or when they're at the Kaaba, people drink the Zam Zam water and it is good for them and should do. People are welcome to drink as much as they like and they can take gallons of Zam Zam water home with them when they returning to their home countries.

Water is very important in Islam and Allah Almighty Himself mentions that all life began with Water.

Interestingly, when regular water is brought in a bowl or in some appropriate container and recited over with the Holy Wise Quran, the water behaves differently and the water becomes healing properties and it will benefit the believer who consumes the water or who bathes in the water as part of his bath or shower.

I'll also post that link in the comments, please watch.

there is no holy water in the Bible there's no mention whatsoever of sprinkling somebody with a special holy water for any reason in the Bible. The only mention of a special water is in the Old testament it prescribes a recipe ashes from a sacred red heifer mixed together with its fat dissolved into the water to cleanse you from touching something sick or dead. It's a strange-sounding ritual when you read it in the Bible but when you actually perform the ritual in modern-day times you understand the ritual is a recipe to make common everyday ordinary lives soap to this very day we're performing the ritual of the sacred red heifer ashes and fat when we take a bath

See the linked info: https://www.newadvent.org/cathen/07432a.htm

Water blessed by a priest used in various sacraments such as Baptism and added to the wine in the Eucharist. 

WATER PURIFIED BY THE LORD

Deception and mind control.

No significance at all. It's just more religious nonsense.

Only in Christianity. It might repel some demons not all.