786, I bring not peace, but a sword:
Nowhere in the Bible does it suggest that we would not see the Father in heaven. Christians accept the fact that we will not see the Father in this life, because we are in corrupted bodies and will die in His glory. But our resurrected bodies will be glorified, and seeing the Father in the hereafter is not out of the realm of possibility according to what we now know.
Also, even if we only see Jesus, it will still be a reward (even for those who see Him again). As a Muslim, you believe you will see God's true essence in heaven. After a million years in eternity you would have gotten use to seeing God. Are you then going to say that it is not a reward to be in His presence even if you were with Him for so long? Also, the "reward" for Christians is not only seeing Jesus (and/or the Father), but dwelling with Him for all eternity in a life of peace and tranquility.