...it is already difficult to find a good life partner without all the restrictions on religion so why not simply fall in love, and like a true Karma Yogi say "Consequences be damned".
Hi Maximus,
Yes, there is of course (in most jurisdictions) no law stating that you can't marry someone of a different religion. So why not dare to see issues like this with an open mind, like you do? However, most have probably found through history that life in a marriage has a higher chance of success and mutual understanding if the partners have the same religion. But I don't think that is because of the nature of religion itself vs. marriage, but rather because many may have a limited view of religion and how it can apply in their life.
If both partners are able and willing to live up to the highest principle of any religion, which is unconditional love, and see that in this there are no conflicts between any religions, then they could live happily together and understand the other's religion perfectly. However, if not, then it's good to be aware that it will take a lot more effort to share a life with someone of a different religion, even if there is a lot of "falling in love", which may not be unconditional, and which may not last through the whole marriage. It's good to be aware of possible consequences, because otherwise things may turn out very unexpectedly.