SP, you have really put a very valued qn in my opinion. I believe that a true religious man can always patiently adhear the other religious people. I'm of the strong opinion that our ancient "AVATARS" like "Ramkrishna Paramhansa", "Nemai Chaitanyadeb" etc. used to make any difference between the religions. In fact, they were true seculars. A true secular may worship of his own God but he can not look down upon other religious people or, their culture. Thanks.
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Yes, but secularist unable to give proof in his consent as Allah says in the Noble Quran"(2:23) And if you be in doubt whether the Book We have sent down to Our Servant is from Us or not, then produce, at least, one Surah like this24 . You may call all your associates to assist you and avail yourselves of the help of any one other than Allah. If you are genuine in your doubt, do this.