To answer my own blog title question: Yes, I do believe that religiosity tends to dilute people's enjoyment of life.
Having been religiously-minded for about 35 years, and churchless now, I consider myself well qualified to address this question. Even though I was a member of an India-based spiritual organization, my experience seems to be applicable to devotees of Western religions also -- including Christianity.
I used to believe in life after death, God, and "heaven."
I put that word in quotation marks to indicate the difference between an Eastern/mystical conception of an ultimate divine reality, and how heaven is viewed by Christianity, Islam, and Judaism. However, the basic notion of a Better Place true believers enjoy for eternity is common to most religions.
Eternity. Therein lies the dilution problem.
It's essentially the flip side of Pascal's Wager, the flawed argument that logically we should believe in God, since the downside of not-believing could be missing out on eternal bliss, while the earthly loss of believing is minimal, a few brief pleasures foregone.
I've argued that it is better to bet on an Anti-Pascal's Wager.
A big benefit of living life without religion is that it commits you to living in the here and now, rather than the there and then. You don't have one mental foot in an imaginary after life, which causes believers to be unbalanced in earthly reality.
...Pascal's Wager is founded on a belief that we can know God's payoff. The anti-Wager is a more honest bet: nobody knows what will occur in the next life, so we need to make the most of this one.
I wrote that post a bit over six years ago. Now, older (if questionably wiser), I feel even more confident that what I said is correct.
Because with every passing year, my astonishment and gratitude at being alive grow stronger. I'm pretty sure that I wouldn't feel this so intensely if I still believed that the life I'm experiencing now is just a passing moment compared to what awaits me, lifewise, after I die.
Meaning, I used to think "I'll have another chance." Either in another incarnation here on Earth, or in another form of existing on a higher realm of reality.
So my attention and interest was split. While going through physical experiences (child-raising, work, marriage, travel, whatever) I'd also be envisioning how the spiritual teachings I accepted looked upon this world.
Which basically was as a lower form of creation, a temporary resting place for the soul before it makes a journey back to God.
Looking back from my current perspective, this belief definitely diluted my enjoyment. I couldn't throw myself wholeheartedly into life here-and-now, because I also was concerned about how those experiences could affect my life there-and-then.
This isn't exactly like "spiritual bypassing," but it is close. The author of that piece says:
...I am spreading the news about spiritual bypass as a reminder that we are not supposed to rise above it all. We can't out-run our own feet. We can't out-think our own brains. We can't override this human operating system that we live and breathe in every hour of every day, freeing ourselves of pain and problems. Not perpetually anyway.
We need to remember that spiritual practice and emotional growth are not about achieving a particular quality of feeling ("good"). Being a human being on a spiritual journey isn't about getting cash and prizes all the time, it is about being in the present moment, whatever it happens to look like. What are you experiencing right now? And how about now? Can you be present to all of your feelings without any one of them defining you?
We should be living life vividly now, not imagining that this black and white world, spiritually speaking, is just a pale reflection of the technicolor realm we'll be enjoying after death. What if that fantasy never happens, as it almost certainly won't?
Diluting our enjoyment of life as it is by pouring in excessive thoughts of what might be, that's crazy. Assume that this moment will never come again. And that one day, all moments will cease for us.
If eternity exists at all, it is in recognizing that each and every experience we have in life is infinitely precious -- being finite.