I'm not really a fan of the implication that Matt (who you clearly don't know if you don't know where his religious stance comes from) doesn't know christianity because he isn't currently a christian - especially considering recent evidence that shows that agnostics and athiests are generally more familiar with theology than christians.

Of course, it probably wasn't decent of Matt to say your christian beliefs are akin to a hallmark greeting card, but perhaps you've run into each other on this before.

Either way, I don't think any speculation on what the denouncers intended is valid - we're not them. Just like I'm not really going to go into someone speaking out about homosexuality "in the context of someone knowingly spreading HIV." I'm not sure if you're aware of the conflation here, but he might as well be speaking out about the sin of being African-American.