It is perfectly fine to say Christ is the only way to God.
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me. If you really know me, you will know my Father as well. From now on, you do know him and have seen him.” -- John 14:6-7, NIV
It is perfectly ‘tolerant’, as long as you don’t have as a goal suppressing other people’s beliefs. It is perfectly fine for Muslims to think that Islam is superior to other religions, but it is not acceptable for them to impose (or even think about imposing) their belief on others in any way.
It is perfectly fine to say you belief Christ is the only way to God.
It is also perfectly fine to declare that your belief is based on faith.
Hebrews 11:1 - Now faith is the substance of things hoped for, the evidence of things not seen.
First, it is incumbent upon the speaker to define “tolerance”. The objective, always, of Christianity in the modern era, is to gently, through example and appeals to both emotion and logic, that acceptance of Christ as Savior is a fully VOLUNTARY act. But with the understanding that if the spark of belief is not lighted in the breast of the potential convert, that is not necessarily a fatal flaw of the unconvinced, as the inspiration may occur at a later time. Or sometimes, not at all.
Forcible conversion to the particular set of religious beliefs, as practiced by certain other cults claiming supernatural authority, up to and including slaughter of those unconverted, would seem to defeat the whole purpose of the drive to proselytize, by creating a class of “believers” that only remained in the religion because of fear of terrible punishment at the hands of not a divine power, but other very savage and unforgiving men. And the dedication to that set of beliefs has to be proven over and over by complying with demands that truly horrible acts must be committed to assure these same savage and unforgiving men that your faith is “pure”.
I just do not see an upside for that kind of enforced “faith”, which is certainly not “tolerant”, and would never practice reciprocity with the Christian version of tolerance.
If one believes any religion, one implicitly believes it is true and the others are false. This is a silly grouse.