What is the ruling on a Muslim woman marrying a Christian man who claims to have embraced Islam, while there are doubts about his true intentions and his willingness to be circumcised, and is it obligatory for me to attend this marriage?

Whoever pronounces the two testimonies is judged to be a Muslim, and it is permissible for him to marry a Muslim woman. He is not obliged to be circumcised so that he does not shy away from Islam, but he must commit to the five daily prayers.