why? Religion gives you life a big frame. You don't have to do the Jesus thing all the time. It's enough to acknowledge, that life ends at one point and behind that religion starts. You can take this point and then you think your life backwards recursively. Retirement -> children move out -> career -> build a house -> have children -> marriage -> university -> fool around->...
A good religion helps you to to reach those milestones in life by highlighting them. It has nothing to do with bible studies or "feeling god" or something. It's just deep reflection about your life and your self.
And if you let that slip, you will lose a part of your happiness.
You don't need religion for any of that. You can set your own goals and not be required to meet anyone else's expectations; which is all religion is, other people's expectations.
I know plenty of non-religious people I couldnt count one nihilist amongst them.
Religion requires all kinds of additional burdens over and above setting some standardized life milestones, the cost is very high (submitting your mind to external control) for minimal return (knowing you met someone elses goals).
I don't mean to sound confrontational, but religion is (in my view) very damaging; it prevents people from asking questions about what is right, by prescribing what is right.
^All of this.
And this: