It is important that we come to the conviction that our tradition is THE BEST!
When we ascertain that fact, then it is illogical to keep looking around for "better" teachings in other traditions, it is a waste of time, and we do not have the luxury of time.
Our tradition is not THE BEST in the absolute, that would also be illogical, because a "tradition" is only a method, a mean to reach an aim. So the tradition is not the aim in itself, it is not the ultimate, for the ultimate is the aim, not the mean.
My tradition is THE BEST FOR ME, that is what it means.
In order to go from point A to point B, there are many various ways, and various means, I can go by foot, by car, by boat, by train, by balloon and through many different routes, but if I spend my life time inspecting and comparing the different routes and means, I'd end up at the same place at the end... Worse, I have wasted a life time already, and how can I be sure that I'd have another one again?
So if somebody comes to the strong conviction that the Muslim faith is THE BEST (for him), then why hesitate, some should practice Islam.
Spirituality is not an object of intellectual research, or to say this more accurately, it is not ONLY that.
If one keeps it at that only, then it has very little effect on one's mind, very little, and it may even make one become more proud and more "up-side down pot"-like.
I have once met with a great university scholar of Tibetan Buddhism who met with a High Lama for a discussion.
This scholar had met with many Lamas and Rinpoche's before and even the Dalai Lama himself.
that scholar explained in great detail to this high Lama the signification of the shapes of the different stupas, the levels, etcetera...
After having patiently listened to the scholar's explanations over the signification and symbolism of this shape, that aspect, etc... That High Lama finally told the scholar: "all what you said is very interesting, but completely useless!"
The scholar was very surprized at that comment, and to this day still is trying to figure out what this high Lama meant when he said that....
It is as useless as a detailed explanation about how to get somewhere when one does not go anywhere and has no intention to go.