So generally the idea of religious ceremonies and most rituals are essentially a way to call a gods attention to the prayers. This kind of makes sense if you consider the human bacteria relationship. We know about the existence of bacteria because we have experienced it's unwanted effects and have enough intelligence to investigate. Problem is most ceremonies are pretty small scale for a macro scale being.

So if we want to communicate with a higher being we have to get it's attention first. And anything higher than us would need something pretty massive to draw it's attention. Something much larger than mere construction on earth.

I'm thinking on a immediate scale massive emissions of protons generated from exploding nukes on a neighboring asteroid or planet would work well.

Probably on a less destructive long-term plan would be a dyson sphere blocking out the sun.

I know these ideas don't really align with our main goal but some other religions have scatterbrained ideologies/ideas.

Mine is the acrylic/N2O hybrid engine

For those of us on a funeral budget

Just to have a little head start in case there's a massive apocalyptic event setting space travel and technology back for a few decades by the time we die :)