The Lord doesn’t need a temple; we do

We may construct a gorgeous temple and spend thousands of dollars, but such a temple is not required by the Lord. The Lord has many millions of temples for His residence. and He does not need our attempt. He does not require opulent activity at all. Such engagement is meant for our benefit. If we engage our money in constructing a gorgeous temple, we are freed from the reactions of our endeavors. This is for our benefit. In addition, if we attempt to do something nice for the Supreme Lord, He is pleased with us and gives us His benediction. In conclusion, the gorgeous arrangements are not for the Lord’s sake but for our own. If we somehow or other receive blessings and benedictions from the Lord, our consciousness can be purified and we can become eligible to return home, back to Godhead.

Srimad-Bhagavatam 5.3.8 purport