https://codex.buddypress.org/theme-development/wordpress-to-buddypress-theme/
Open up the header.php of your wp-church theme file and copy all. Go to pastebin.com and paste what you copied, click submit and post the generated URL here. Do the same for your index.php, page.php, sidebar.php and footer.php

The pastebin for footer.php is blank and the pastebin for sidebar.php looks incomplete.

Initial scan shows that you’d have to use the first method of Step 3 i.e. changing 16 files transferred to your WP theme, and that it’s going to be a bit complicated. It may or may not work on the first try and at a certain point I might have to tell you that you’d need to contact theme author to help you check/correct what I’ve posted here. Now we’re done with the disclaimer do post the footer.php and sidebar.php in pastebin.com

Download the 6 BP template folders tranferred to your wp-church theme during the BP compatibility process down to your computer hard drive. For this session though, we’re going to check how it turns out with one file first to see how we’ll proceed.

Open up /activity/index.php and at the top of the file, replace
`

For the remaining 15 files (If you have multisite/created a network then you have to edit blogs/create.php and blogs/index.php files. if not, then you need to fix 13 more files), all have the same changes at the BOTTOM of each file except for registration.php, where you’ll also need to add the following script in the replacement code in between get_sidebar and get_footer
`
jQuery(document).ready( function() {
if ( jQuery(‘div#blog-details’).length && !jQuery(‘div#blog-details’).hasClass(‘show’) )
jQuery(‘div#blog-details’).toggle();
jQuery( ‘input#signup_with_blog’ ).click( function() {
jQuery(‘div#blog-details’).fadeOut().toggle();
});
});
`

The TOP portion of each file will almost be the same as what I posted above for activity/index.php. The difference being some BP page titles are wrapped within opening `