:wasalamex
The forum allows non muslims, and thats one of the reasons why we got the comparative religion section. Islam is a religion for the whole of humanity till the end of time (till the day of judgement) so anyone has the right to come on the forum.
There have been alot of incidents when alot of disbeleivers came to attack islam on purpose, without the intention of learning about islam. When the muslims started to answer their questions - the disbelievers got angry and started getting offensive, so we had to ban them.
If you ever feel that reading their posts might weaken your faith, then i think its important you dont go to the 'comparative religion' section too much, and that you visit the 'basics of islam' section more.
I have to say that i've experienced this feeling too - and this is the reason why i stay away from other faiths, we need to gain alot of knowledge about our own faith first - once we get deeper and firmer in iman (faith) - only then should we try to give da'wah (call to islam) to the non muslims.
Hope you understand what i mean insha Allaah..
:salamext: