Ok, this seems to have split into two separate subjects:
1) Complimenting coaches
2) Religion
Topic number one is perfectly fine to discuss here. Topic number two is not. Further posts relating to religion (either in favor of it or against it) will be edited or deleted.
To the OP: no worries, no harm done.
Anyway, getting back to the intended subject of the thread...
It's always good to compliment coaches. That coach was right, in that quite often we only hear from parents when they're unhappy; often, this leads us to fall into the trap of thinking of parents in general as adversaries at best and ignorant whiners at worst. This is, of course, a completely unfair generalization, but our perspective tends to be biased by the fact that the cranky parents are the ones we always hear from and the happy parents tend to keep it to themselves.
Complimenting your coaches will create a better atmosphere in the gym and better communication between you and the coach. I highly recommend you be generous in your praise to any coach who you think deserves it.
And, to reiterate, no more posts either endorsing or bashing christianity or religion in general will be permitted in this thread.