Fist, I was under the impressions that Catholics were Christians. I worry about any source that doesn't see it that way.
Second, the wording sounds intentionally deceptive. There are already Catholics and other Christians who are not allowed to purchase firearms because of a Dishonorable Discharge, felony conviction, or other disqualification unrelated to the first half of "clinging to God and to guns". The link (yes, despite tradition, I read that) is not convincing. I'm not debating whether Obama is an evil, anti-American tyrant wannabe who would cheerfully deny Americans our constitutional rights, just questioning whether the drug-addled communist is guilty of this particular charge.
Related article? U.S. Army labels Southern Baptist Convention ‘hostile’ - http://www.freerepublic.com/focus/news/3012025/posts?page=55