If the latter do not agree with the former they are lies or at best errors. It is obvious that two conflicting statements cannot both be Truth, nor can they have the same source. Consequently, the believer of established Truth can have no tolerance towards non-truth. The only aspect in question may be the mode applied to establish the truth. Religious tolerance is lack of love for the Truth - and the Author of the Truth.
Religious intolerance is a sickening form of self-deception.
But sincerity alone is insufficient. The honest seeker after God must be ready and willing from the beginning to forsake, even at a high price, what has been established as untruth. That demands courage and character. Twenty years have passed since then, involving a substantial degree of study of the Bible and of the faiths of my fellow pilgrims in this world of ours. After having moved to Cape Town, we, i.e. my wife and myself, met a number of Muslims, some of whom became our friends.