Hi Materdei, I love discussing religion and spirituality too! I love your questions.
yes I have read most of the new and old testaments and have found a great deal of goodness and beauty in it. believing in the Prophet Isa (peace be upon him) or Jesus is a core part of our faith, as is Mary (peace be upon her). there is a chapter in the Qur'an named Mary and they both feature heavily throughout the Qur'an. The Prophet Muhammad (peace be upon him) said "all the Prophets are as brothers to me and of them, Isa is the closest to me". we also believe in the return of the Prophet Isa (pbuh) at the end of times.
God says "my Mercy overcomes my wrath". and forgiveness is part of that. we believe God forgives all those who ask forgiveness in earnest.
choosing Islam... Well I could write a book! firstly there is the consistency through time. the Qur'an has not changed since revealation. it was revealed to someone who was known everywhere as the most honest and trustworthy of his community. the Prophet (pbuh)'s nickname was Al-amin or "the true one". all the events around revelation and subsequent miracles/events are recorded and preserved without corruption. I won't go into the technicalities but essentially the chains of narration were strictly maintained due to the system of scholarship. if any one individual in a chain of narration was found to ever have lied, the whole chain was discarded.
second reason internal logical consistency and matching up with science. eg the description of fertilisation and development of the embryo including when the heart starts beating, astronomical facts that were not known until recently etc. etc.
third reason, democracy and social justice within its legal and political system. Common sense laws, rights for women etc.
fourth and probably the most important reason is the feeling in my heart.
for me to be Muslim means seeking God's pleasure, to serve creation in order to serve the Creator, to do everything with good intention and accepting whatever God has given me with gratitude. ultimately its loving God and for His sake loving all of His Creation.
prayer is what gets me through life. its a personal conversation with God. (God says "I am as My servant thinks I am (1). I am with him when he makes mention of Me. If he makes mention of Me to himself, I make mention of him to Myself".
if you were to pray for me today, I would humbly request that you kindly pray that God forgives me my many transgressions and accepts me as His servant and fills my heart with love for Him and those that He loves. thank you so much. I pray you have a long, healthy and happy life. ♡