Is there a God ? if yes then what is it.

100% No. The belief in god has no basis in fact. There is zero proof that any god exists. Some people refer to a personal god. That is you talking to yourself. Believe in reality and not unicorns.

Homeopathy, does it work or not ?

100% No. Unless Oliver Cromwell's piss has healing properties. Placebo? Yes.

Dousing ?

100% No. Luck? Yes.

Healing;

Spiritual

Reiki, and others

Distance Healing

100% No. Homeopathy should come under this list of garbage.

Psychic phenomenon

100% No. More chance of aliens

The effect of Prayer, is there one ?

100% No. Total garbage of the highest order I pray people will wake up and smell the coffee.

Is there life after death

100% No. Your chemical electrical spark stops flickering. Just like turning off a lightbulb. Dead is dead.

Have we a soul

100% No. We have a personality that ends in death and is remembered by the living.

Can a building or place contain a perceivable energy, positive or negative

100% No. Apply any perception you want to any given situation, but its the architect that gave you that sense of awe - not some immeasurable energy.