No, it isn't.
1. God chose the weak things of the world to shame the strong, 1 Corinthians 1:27
Abraham was 100 years old and Sarah 90 when she became pregnant.
Moses was an 80 year old asylum seeker when he led an entire nation out of Egypt.
Saul was the first king - from the smallest tribe of the smallest clan of Benjamin (who had been the youngest son), 1 Samuel 9:21.
David was the youngest in his family, and a shepherd boy - he fought, and defeated, Goliath. Samuel had thought God would choose the oldest, and strongest, of Jesse's sons; he didn't.
Mary was probably a teenage girl when Gabriel told her she would become pregnant.
Jesus was born to a poor, unmarried couple. His earthly father was a carpenter, and they lived in Nazareth.
Some of the disciples were fishermen; one was a hated tax collector.
Christianity started with 12 men who were filled with the Holy Spirit. It was a tiny religion - actually, a Jewish sect - which started in a small country which was one small part of the mighty Roman Empire.
God will choose weaker people over stronger people to do his will - because then he gets the glory. A strong, capable person might be tempted to rely on their own strength/skill/gifts, rather than on God.
2. Women are physically weaker?? Women, who endure 9 months of pregnancy, with all that that involves, give birth - for centuries without epidurals etc - carry small toddlers on their hips while pregnant with a second child, have twins, triplets, quads etc, and then maybe do it all again?
Women who get out of bed feeling like death warmed up because they need to see to/nurse/care for the children, take them to school, clean the house, and expect no help from hubby who is in bed with a cold?
Women who may endure miscarriages/ivf/egg donation and more so they can have a child?
Women who may teach classes of noisy/sickly/contagious/badly behaved children, take charge of a ward full of sick patients, preside in a court of law, walk the beat or attend burglaries or serious crimes, break bad news to heartbroken families - and then go home to cook and clean for their own?
Women who have to work twice as hard, develop thick skins and fight sexism just to be taken as seriously as their male counterparts?
These are the weaker sex?