I am happy if there's an afterlife and if there isn't I won't know anything about it. I would love to live forever, people who say it would be boring amaze me. Perhaps they're bored now.
I also don't agree that believing in the possibility of an afterlife destroys your enjoyment of the present and postpones happiness. That only happens if you're in a religion that won't let you enjoy life and makes you work to appease a deity and earn an afterlife.
Religions don't have anything to do with our existence on this planet or anything that may be beyond. They're selling tickets for a gig they don't know the way to.