The answer to that question is no. God is not faithful because He allowed us to adopt Adrienne. He is not faithful because He allowed the other girls to have babies. Rather, He is faithful. Period. Not faithful because __________. Just faithful. He is faithful through the bad times and the good times, and His faithfulness looks different in each individual person's life.
For me, it is impossible for me to view my life without seeing the faithfulness of God on every aspect, the happy and the sad. God was so faithful to me every step of the road we walked through trisomy 18. He was faithful to carry me through the grief that came with Poppy's death. He was faithful to watch over me and protect me from wrong thinking and bitterness over what happened. And then He was still faithful as He brought me out of the dark waters and into a season filled with happiness. In my life, God was faithful in the way He brought Adrienne into our home, and in the way He has used the suffering we went through for His good. Would that faithfulness be negated if Adrienne had never become part of our family? No.
God's faithfulness isn't an equation. There is no such formula as baby=faithfulness, husband=faithfulness, good job=faithful, good health=faithfulness etc. Instead, God is faithful, always, and the ways we see that in our individual lives are as varied as the sand on the seashore.
It's a slippery slope to begin comparing God's faithfulness from one person's life to another. God isn't fair, and He never claims to be. Instead, He is there, sufficient, faithful, loving, and good. I think we must all except that for our own lives, if we are ever going to be satisfied in God and His plan for our lives.
I want to end by saying this. I never want this blog to be a place where any group feels ostracized. God loves us all equally, no matter what place we find ourselves, and it is never my intention to make anyone feel that if their life does not resemble mine, then God has not been faithful. That couldn't be farther from the truth. I hope you see my heart.