The Advertising Standards Authority (ASA) said it had concluded that the campaign did not contravene the code and it would therefore not launch an investigation – the case is now closed, it said.
The authority said it had received 326 complaints about the campaign, some claiming it was offensive to people of faith and others challenging whether the advertisement was misleading.
"The ASA Council concluded that the ad was an expression of the advertiser's opinion and that the claims in it were not capable of objective substantiation," a statement said.