Hey, @Joshua Milam. This is an extremely polarizing topic.
Full disclaimer, I am no expert, but here's my two cents.
I personally love the idea, but conventional wisdom is a hard "no". Many people believe, and rightfully so in most respects, that Whole or Universal Life policies are a huge waste of money. These people will tell you to get a Term Life policy for much less out-of-pocket and invest the difference in a traditional brokerage account, which will earn you more money in the short term, but they do typically balance out over time.
The big proponents of the idea buy into the "Infinite Banking" concept and there are a bunch of posts about it on the BP Forums. Find more info here in this Millennial Investor Podcast interview with Chris Naugle, or read "Becoming Your Own Banker" by Nelson Nash.
The big things to note are:
1) If you don't already have a Whole Life Policy, it will take years to build up a high enough cash value to take a meaningful loan. At least 5 years, if not 10+
2) These loans are much better-suited to cover down-payments and renovations than to replace a mortgage
3) Make sure you are working with an experienced Insurance expert who knows what they are doing and how to maximize your policy for cash value vs death benefit
If you already have a whole or universal life policy that is not maximized for this, find an insurance expert and roll it into a better policy. (I use a Variable Universal Life policy with Ameriprise.) If you don't already have a Whole or Universal Life policy and want to use this method, consider instead taking out a loan against your stock portfolio (assuming you have one). These loans against your stock portfolio essentially serve the same purpose and carry similar interest rates. Note that you typically will need to have your portfolio managed by a Licensed Financial Advisor and have at least $100k in the portfolio to be able to do this. Again, consult with an expert as not all of these loans are the same and you want to make sure you're in the best one. Good luck!