For one reason or the other, I'm still not clet why Believers raise their hands to the roof or to heavy while praying on their offering. I once thought it belongs to God and he is in heaven, Then i was told God lives in us all,

I'm on my way to church with an offering to be raised when praying but dont know why it is so.

I've never done that.....nor does my church.
Before the deacons come down the isle, they stand before the altar as the pastor prays and the congregation bows our heads in silence.
We, seated and quietly, put our tithes & offerings into the plate when it comes, wait for the deacons to get to the last persons/pews, stand as the offering plates are brought to the front (or until the deacons leave the sanctuary with the plates), and then sing the offeratory praise.
It''s all done decently & reverently.
Not condemning how other churches choose to do it though.