1. why does islam is spreading so fast in last 3 decades?
the reason islam is spreading so fast in last 3 decades is because of sextual immorality wide spread in christians's society like premarital sex,infidelity, homosextualty, porn etc. because of woman nudity everywhere man lost respect for women and because of man dont respect women so women dont respect men.
so man and mostly women joining islam for new lifestyle. this new converts to islam really are refugies of christian's immoral culture taking shelter in islam.
2. how can you stop/slowdown spreading of islam ?
simplely, ban bikini and other skin revealing clothing and porn.
3. what are the reason you cant stop spreading of islam ?
because you believe in freedom to wear bikini and watch porn, a freedom will destroy you and your freedom.
if you ban bikini /skin revealing clothing and ban porn (you)------->>> save christianity/ save western civilization.