As for having an "eternal soul mate," there are two issues with that statement:
1. Why do you expect that people should accept that statement as true?
2. Even if they did, why do you expect that people should believe that believing in your religion and accepting its scriptures is what will lead them to having an eternal soul mate? What if it was another religion that leads to such, for instance?
Eternal families is one of the big Mormon doctrines, I'd be genuinely interested to hear if anyone else is teaching this too? I really do think we are all led by the same God. Needless to say, our marriage vows do not end with "till death do you part" as we make vows that transcend death. Our temple ceremonies are centered around the ideal of eternal families, and the point of heaven for us is creating eternal bonds with friends and families. I really would be interested to hear if there are other groups who also teach the possibility of eternal bonds.
I think we all rely on material understanding to form our worldviews, so I see nothing wrong with that at all.
And what guarantee is there that belief in your religion would necessarily lead to "seeing beyond the physical" (whatever you mean by that)?
The material world can be beautiful, but there is certainly more than that. Thoughts, information, ideas, creativity to imagine what is not yet there, and then create it - conscience - it's a union of the physical and the spiritual that produces a fullness of joy.
33 For man is spirit. The elements are eternal, and spirit and element, inseparably connected, receive a fulness of joy;
34 And when separated, man cannot receive a fulness of joy.
35 The elements are the tabernacle of God; yea, man is the tabernacle of God, even temples;
(Doctrine and Covenants | Section 93:33 - 35)
the material is the house, or temple, of the spiritual. Without a spirit, the temple is empty and pointless.
4) Many people seem to see meaning and purpose in their lives while following other religions or without having a religion at all. I don't see why your religion would have some kind of monopoly on that, at least not if we went by the arguments you've offered so far.
I didn't say they did not have meaning and purpose, I just didn't capitalize it. Theistic beliefs give rise to grander goals, and higher Meaning and Purposes - ie - the salvation of all mankind, present and past - the promise of eternal life, everyone becoming perfected etc. etc. nothing else compares to that.
The rest of the points you've raised all seem to be hinged on the same misconceptions about what being an agnostic/atheist entails, so the same objections would apply to them as the ones I already addressed above.
I agree that many atheists and agnostics live meaningful pleasant lives, I just think there is more out there, and that anyone who closes their eyes to the spiritual is missing out on quite a chunk of what life is all about.